 The installation of all three gyro units was a critical objective of the servicing mission, as three had failed, one was offline due to electrical issues, and the other two had also been experiencing issues with performance.Ground controllers at Goddard Space Flight Center confirmed that all six gyroscopes and the new battery passed preliminary tests.The problems with seating the second RSU set the spacewalkers back in the timeline by approximately two hours, but after Altman asked Massimino and Good how they felt, they replied they were doing well and felt fine to continue.