 The failure would have no impact to the mission, due to redundant systems.In addition to the survey of the orbiter's heat shield, the crew gathered and inspected the EVA tools and spacesuits that would be used for the mission's spacewalks and prepared the Flight Support System (FSS) for berthing with Hubble on flight day three.Following the crew's post-sleep activities, they went to work performing the rendezvous operations that included burning the orbiter's engines to refine the approach to the Hubble telescope.