 After the installation, controllers at the Space Telescope Operations Control Center at Goddard Space Flight Center sent commands to the camera to perform an aliveness test, which passed, indicating the camera was installed correctly.The next task was to remove and replace the telescope's Science Instrument Command and Data Handling Unit, or SIC&DH, a computer that sends commands to Hubble's science instruments, and formats science data for transmission to the ground.This was the item that failed in September 2008, delaying STS-125 while engineers prepared a replacement part for the mission, and the crew trained for the new task.