I'm sure it was a little embarrassing to have to postpone the launch while the President was watching, but there's no substitute for safety on the penultimate shuttle mission. A fault in Aft Load Control Assembly #2 (LCA 2) means NASA will remove and replace the LCA: in other words, yank out and electronics box and plug in a new one, then test to make sure they have the right diagnosis and it's ready to go. The 8th is the earliest the shuttle can try for orbit.
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