As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT CABIN DOOR CAME OPEN IN FLIGHT, DOOR WAS LATCHED ON THE GROUND PROIR TO TAKEOFF. BOTH FRONT AND REAR DOOR LATCHES WERE CHECKED BEFORE TAKEOFF BY PUSHING ON CABIN DOOR HARD AFTER LATCHING DOOR. FRONT LATCH FAILED IN FLIGHT, REAR LATCH HELD FOR A SHORT PERIOD OF TIME AND THEN FAILED. THE DOOR LATCH WAS STILL IN THE LATCHED POSITION.