NASA engineers say they have identified the likely source of a problem on space shuttle Endeavour that led to the scrubbing of last week's Florida launch.
Technicians said the failure was in a box of switches controlling power feed to heaters on a fuel line for Endeavour's auxiliary power unit, a NASA release said Monday.
The box will be replaced but the work and testing will take several days to complete, after which managers will meet to discuss a new launch date, expected to be no earlier than May 8.
Workers at the Kennedy Space Center have drained Endeavour's external fuel tank, and the service structure was moved back around the shuttle to protect it from the elements and to gain access to the shuttle's aft section, NASA said.
Endeavour's six astronauts have returned to Houston and will be participate in some additional training before they return for the next launch attempt, the agency said.
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