Installing the new port-side array and replacing one of the four Reaction Wheel Assemblies

Changing the Faint Object Camera (FOC) with the Advanced Camera for Surveys (ACS) and installing a new electronic support module für the NICMOS Cryo Cooler

Changing out three boxes, each containing two of the telescope's six gyroscopes, and three batteries.

Repairing and upgrade the Space Telescope Imaging Spectrograph and install a stainless steel blanket on Hubble's exterior. The blankets provide additional thermal protection for some equipment bays, replacing the existing multi-layer insulation that has degraded over time.