As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT DECK DOOR WAS STUCK CLOSED AND WAS UNABLE TO BE OPENED FROM THE OUTSIDE. DISCOVERED FLIGHT DECK DOOR STOP ENGAGED WHILE DOOR WAS CLOSED. CLEANED DOOR STOP AND PERFORMED OPERATIONAL CHECK OF COCKPIT DOOR. PER AMM 52-51-00.