Replacing a depleted nitrogen tank and a device used to help the flow of coolant from the truss. They also started inspecting, cleaning and lubricating the starboard SARJ and begin replacing 11 of 12 trundle bearings.

Completing starboard SARJ cleaning, lubricating and trundle bearing work.

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

Installing a spare space-to-ground Ku-band antenna on the station's truss. Then they installed a new tool platform on Dextre. The spacewalkers breaked the torque on bolts holding batteries in place on the truss.

Removing and replacing four of the six batteries on the port truss to store electricity from the solar arrays on that truss. The used batteries were installed on the cargo carrier for return to Earth on Atlantis.

They installed a power extension cable between the Unity and Tranquility nodes to provide a contingency power source. The spacewalkers moved the failed ammonia pump module from an attachment bracket to a stowage platform adjacent to the Quest airlock. They next replaced a guide for the rail cart system used for moving cargo along the truss.

The astronauts removed thermal insulation from a platform. Bowen then installed a camera assembly on the Dextre robot.