Sunday was a day of rest finally. Well, it was supposed to be a day of rest. And it was, mostly. We did not have much of anything scheduled as we were supposed to recover from all the spacewalk activity on Saturday. I took it easy as much as I could. I did my exercise and cleaned up and organized the Station some. Doing a spacewalk creates an explosion of stuff in the Station. Everything that was neatly packed inside the airlock had to be removed so we can work in the airlock and use it, well, as an airlock. Tracy and Doug needed to begin configuring their hardware for the next spacewalk and I helped them out some. In the afternoon we had a debrief with the folks on the ground to talk about the last spacewalk and to start the run up to the next one. They are still trying to decide what the plan of attack is going to be to deal with the leaking connector. Right now the next spacewalk is on the books for Wednesday. I will be surprised if we actually make that date since the ground has to first decide what we are going to do and then they will have to test drive the procedures in the pool. But, you never know. They may make it. If they do, we will be ready. 
On Monday our schedule reflected the fact that we were back to official spacewalk preparations. My main duty in this regard today was reviewing procedures. We received the preliminary procedures for Tracy and Wheels. I did not have any robotics procedures yet, but I expected that much of my planned activities would be similar to or the same as what was originally planned since we will generally be continuing the process of removing the failed pump. The ground is working on a plan to release all the ammonia in the connection lines safely in order to allow the leaking connector to be disconnected without getting ammonia on the spacewalkers. Assuming that plan comes together and it works, then Tracy and Wheels will proceed with taking out the old pump. Then there would be a third spacewalk to install the new pump.
Other than going over the procedures and having the standard briefing with the ground to discuss them, I did a little work in other areas in preparation. Batteries needed to be put back into their respective hardware after charging, cameras needed to be readied to go out with the spacewalkers, and I had to perform a checkout of the workstation that I use to operate the arm. I am not really sure why I did this now and not before the first spacewalk. Perhaps there was not time.
Exercise and a little work for the experiment folks rounded out the rest of my day. I got one of the freezers that had been turned off due to all our required powerdowns ready to turn back on.
Tuesday really flew by. The ground was pushing full steam ahead to have the second spacewalk on Wednesday. If we thought the day before the last spacewalk went quickly, today really seemed like there was time compression. Aside from waiting on the latest information and procedures and having a conference with the ground to find out what they knew at the time, Tracy, Wheels, and I did the required preparation work to get the suits ready for the spacewalk. I think it was more difficult today because we did not have any final procedures to review. The operations folks on the ground were working hard on taking in all the data and information from the last spacewalk and everything new from the engineering community to sort out the best path forward. We had a couple of procedure updates during the day. But ultimately by the time Tracy and Wheels started their campout in the airlock and by the time I went to bed, we still did not know exactly what we would be doing the next day. We knew the generalities, but not the particulars. I know I felt a bit on edge because I had not had a chance to see some of the maneuvers that I would have to do. I knew that the ground would not steer me wrong, but I would have felt better had I had a chance to run through all the positions once to see what the big picture was.
Wednesday, just like last Saturday, was a very long day. However, I think all of us were not quite as tired by the end of the day as we were after the first spacewalk. We had great luck in that overnight the team on the ground decided that we could go back to the leaking connector and see if it had miraculously fixed itself. Apparently there are some ways this connector could fail that would allow it to work properly later after a period of time. We were not given the details on what exactly would cause this situation to occur, so I do not really understand how that would work. But, at any rate, Wheels got on the end of the arm, I flew him over to the connector and he was given the go to try closing it again. This time, lo and behold, it worked. No leak. There was much rejoicing in space and on the ground. Essentially that meant that we could cut out a huge chunk of work that was planned for this spacewalk. If the connector was still leaking, we were going to have to close off two other connectors and vent all the ammonia in the closed-off section overboard. Not only would that have been a lot of work, it would have used some of our precious ammonia resources and it would have risked contaminating the spacewalkers with ammonia again.
With the connector closed, Wheels was given the go to disconnect the connector from the pump. Naturally it did not want to come off easily. But, eventually, after a lot of work on it and "shaking it violently" (the actual words that the ground said he had permission to do), it came off. With the connector off it meant that all the major hurdles for the pump had been cleared. Tracy got all the electrical connectors undone and the two of them got all the bolts undone that were holding the pump in the truss.
While Tracy was working on the electrical connectors, I flew Wheels down to the location where the spare pump was stowed. He picked up a fixture that he and Tracy would attach to the broken pump. This fixture was needed to allow the pump to be parked on the Mobile Transporter on the Station truss. The Mobile Transporter is a fairly large and fancy platform that can drive up and down the truss. At certain locations you can park the Mobile Transporter and hook it up to power and data outlets. What this allows for is the ability to base the Canadian robotic arm on the transporter so you can do work at the far reaches of the Station. In addition to that capability, the Mobile Transporter has a gizmo on it that is just like the end of the robotic arm. This gizmo can attach to the same fixtures that are used when the arm grabs onto things. The plan was for us to remove the broken pump from the truss and stash it on the Mobile Transporter by means of the fixture that Wheels retrieved.
After I flew Wheels back to the broken pump he and Tracy went about attaching said fixture. It was not easy to install at all, but they finally got it on and bolted down. At this point, my job got a little more sporty. Wheels, who was still attached to the end of the arm, grabbed onto handles on the pump and I proceeded to back the pump out of its place in the truss. While he was holding it, I flew the pump over to the Mobile Transporter and carefully flew it into the mechanism that would attach the pump to the transporter. What made this operation extremely challenging was that there was a lot of bounce anytime I made an input to move the arm. This meant that even though I was flying a slow and steady approach to the transporter, the pump was not staying steady.
The arm itself has a certain amount of inherent flexibility and I am sure that Wheels was flexing some as I was moving him and the pump around. All combined, it made for a pretty unsettling picture. I am actually glad that the ground did not have video downlink at the time of these maneuvers. I am sure if they had seen what I was seeing, they would have been much more nervous than they probably already were. What I ended up having to do was move Wheels and the pump a little bit, wait for the system to stop bouncing, and then move them a little bit more. I was afraid that if I just went straight in, I would have ended up whacking the fixture on the capture gizmo. In the end, I was able to sneak the pump in and get it attached to the transporter. Whew!
With the failed pump out of the truss and onto the Mobile Transporter, our main tasks for this spacewalk were done. We had a little bit of time left so Tracy and Wheels did some work on the replacement pump to start getting it ready for its removal on the next spacewalk. Then it was back to the airlock for them. After they got back inside the hatch, the ground had us run the same ammonia testing procedures that we did last time, just in case. This time there was no evidence of ammonia at all. Once again, we ate dinner about 10:30 p.m. after getting the suits cleaned up for the night.
Thursday was a "day off." I slept in. I know that all the excitement and stress of the last week and a half had been building up and I needed some solid sleep. The ground graciously let us have a respite from the standard morning tag-up, so there was no need to set an alarm. When we finally emerged for the day, we had about a half a day's worth of work scheduled. Tracy and Wheels worked with the suits and I took care of some of the Station's systems. Between getting up late, the work we to do had and our daily exercise, the day was gone.
Friday was also an off day. Actually it was more off than Thursday. It was a very welcome break. I had little motivation to do much of anything other than my exercise. Though, we did clean the Station even without it being on our schedule formally. Since we had not done the regular cleaning in quite some time, the filters needed a good vacuuming. As usual, all that doing of not much caused the day to fly by.
It was back to work for us on Saturday. Since the next spacewalk is planned for Monday, we do not get to have a weekend. We had to start back in with preparations for that spacewalk. I had a preliminary set of robotics procedures to review and my crewmates went over the latest procedures for their activities. In and around our reviews, I had a few Station maintenance and other spacewalk tasks to do - reboot certain laptops, get the cameras ready for the spacewalk, etc. We also had our standard conference with the ground on the latest and greatest plans.
This morning when I got up it was about 1:00 a.m. in Houston. We happened to be just approaching the U.S. at the time. I knew that the Perseid meteor shower was going on and I wanted to see what I could see. I was in luck. I saw several meteors as well as a west coast lightening storm that was the most impressive one I have ever seen. It was quite a show to watch out of our cupola.