What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: AFTER TAKEOFF AROUND 19000 FLIGHT ATTENDANTS INFORMED US THAT THE AFT LEFT DOOR HANDLE WAS MOVING UP AND COULD NOT BE KEPT DOWN; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. CLEANED AND LUBED L2 DOOR CAM LOCKS AND HINGES, PER AMM 12-25-12. PERFORMED PRESSURIZATION TEST, PER AMM 21-31-00, NO DEFECTS AND LEAKS NOTED, DOOR HANDLE STAYED IN CLOSED POSITION.