The repair work began Sunday and should be completed in time for Endeavour to lift off Wednesday on the space station construction mission. But that's the same day a pair of science spacecraft are scheduled to blast off for the moon.
NASA's top officials have yet to decide which mission takes priority.
The seven Endeavour astronauts are sticking around Florida's Kennedy Space Center, just in case their flight gets called up first. They will deliver and install the final segment of Japan's space station lab.
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