(CNN) -- The rescheduled launch date of the space shuttle Endeavour,
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The launch,
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Technicians continue to test the electrical system to determine what caused a circuit to short out, causing the cancellation of Endeavour's April 29 launch, officials said. The liftoff was delayed until this past Monday and then to no earlier than May 10 at 11:21 a.m.,
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NASA repair crews have already replaced the power distribution box that shorted out a circuit supplying power to heaters for the orbiter's hydraulics system.
The scrubbed April 29 launch postponed what promised to be an emotional moment for the shuttle's commander, Mark Kelly.
Kelly's wife, U.S. Rep. Gabrielle Giffords,
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Giffords returned Sunday to Houston and TIRR Memorial Hermann hospital, according to a post on her Facebook page.
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NASA sources Endeavour launch could be as late as May 13 - CNN.com
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