Replacing a depleted nitrogen tank and a device used to help the flow of coolant from the truss, the backbone of the station. They also removed thermal covers from the Japanese Kibo module to inspect the berthing mechanism where the module's exposed facility will be installed during the STS-127 mission in 2009. They also started inspecting, cleaning and lubricating the starboard SARJ and begin replacing 11 of 12 trundle bearings. One was replaced during the STS-124 mission in June 2008.

Completing starboard SARJ cleaning, lubricating and trundle bearing work.

Removing several thermal covers on the port SARJ. Kimbrough lubricated the port SARJ, while Bowen reinstalled the thermal insulation covers (removed on first EVA) on Kibo. He then installed two GPS antennas on Kibo's logistics module, while Kimbrough installed a new TV camera on the truss.