NASA has delayed next week's launch of space shuttle Endeavour by one day because of unexpected work to fix a leak in the crew cabin, officials said Friday. Endeavour's planned liftoff is now August 8 at 6:38 p.m. ET, the Associated Press reported. Liftoff is now set for Wednesday evening. Engineers installed a new valve Thursday to replace a leaky one in Endeavour's crew cabin. Although the unit tested fine, NASA ran out of time to meet a Tuesday launch, said NASA spokesman George Diller.