As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LEFT AFT DOOR STILL SHOWING ARMED WHEN DISARMED. FLIGHT DECK INDICATIONS FLICKERS ARMED DISARMED IN THE AIR. REPLACED DETECTOR PROXIMITY SENSOR 17WV1 PER AMM 52-71-11 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED.