As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER UNLOCKING COCKPIT DOOR IS HARD TO IOPEN . REMOVED FROM SERVICE. INSPECTED FLIGHT DECK DOOR AND LOCK MECHANISM WITH NO DAMAGE FOUND OPEN ANC CLOSED DOOR AND OPERATED LOCK MULTIPLE TIMES WITH NO DEFECT NOTED. COULD NOT DUPLICATE. RETURNED TO SERVICE.