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KENNEDY SPACE CENTER, FLA. -- At Launch Pad 39B, the open doors of the payload canister, inside the environmentally controlled Payload Changeout Room, reveal the Hubble Servicing Mission cargo. At the top is the Orbital Replacement Unit Carrier and at the bottom is the Flight Support System. Installation of the payload into Discovery is slated for Friday, Nov. 12. The mission is a "call-up" due to the need to replace portions of the pointing system, the gyros, which have begun to fail on the Hubble Space Telescope. Although Hubble is operating normally and conducting its scientific observation…