/*NASA*/ postponed Friday's launch because of a faulty heating part. They said Sunday that the further delay is because technicians need to replace a switch box in the engine compartment. Two days of testing are required once the new box goes in, said a NASA spokesman.
Another launch was not scheduled.
As late as Saturday, the astronauts and their families were still hoping for a possible launch attempt on Monday. But NASA gave up on that once it became clear extensive repair work would be needed aboard the shuttle.
President /*Barack Obama*/ and first lady /*Michelle Obama*/ visited Cape Canaveral to see the launch and meet with the crew of /*Endeavour*/, including mission commander /*Mark Kelly*/.
Obama also met briefly with Kelly's wife, Rep. /*Gabrielle Giffords*/, who was shot through the head in January.
The Associated Press contributed to this report.
