The astronauts moved a failed cooling pump from temporary to long-term storage on the station's truss. They also installed a new relay system that will provide backup power options to the mobile transporter, which moves the large robotic arm around the out outside of the space station.

The two-man team replaced a sequential shunt unit electronics box, a voltage regulator, on the starboard truss that failed in mid-May. Although the station has since operated normally on seven of its eight power channels, the voltage regulator replacement is considered a high priority.