The 100 rail cars pulled out of service earlier this month for a dangerous door flaw have all been fixed and returned to service, Metro announced Tuesday. The transit system found problems July 2 with the door motors inside the Breda 4000 series cars, which allowed doors to open while operating during high-speed travel. Metro officials immediately pulled all the cars for repairs. That means Metro can resume running more trains with eight cars, after shortening trains during the repairs. But the transit agency also has been blacking out some rail cars as 30 to 40 a day have air conditioning problems, according to Metro. - Kytja Weir