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 LOCKING SYSTEM DIFFICULT TO OPERATE. MAINTENANCE FOUND THE DOOR LOCK BINDING PREVENTING IT FROM BEING ABLE TO ROTATE. MAINTENANCE REPLACED THE DOOR LOCK / LATCH MECHANISM AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 52-51-21.