What was found
AFTER TAKEOFF, AIRCRAFT WOULD NOT PRESSURIZE. DISCOVERED 6 FT AFT CABIN DOOR OPEN APPROX 2.5 INCHES. DUMPED FUEL AND LANDED VCP WITHOUT INCIDENT. RESET DOOR PER M/M 52-10-01-2 ARMS OK. CHECKED FOR ELECTRICAL ANOMOLIES TO LOCK PIN RELEASE AND ACTUATOR. FOUND NO POWER COMING OUT OF AFT DOOR LIMIT SWITCH IN THE DOOR STOW POSITION. OK TO CONTINUE ON PREVIOUS DEFERRED. INSTALLED DOOR WARNING LIGHT STRIKER PLATE, POSITION SWITCH PER M/M 52-70-00, DOOR INDICATION OPS CHECK GOOD PER M/M 52-70-00.