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 EXTREMELY DIFFICULT TO OPEN IN FLIGHT. AT FLIGHT LEVEL 320 WITH CABIN DIFFERENTIAL PRESSURE OF 7.9 PSI, FLIGHT ATTENDANT WAS UNABLE TO OPEN FLIGHT DECK DOOR. DOOR WAS FORCED OPEN WITH ASSISTANCE FROM CABIN. DOOR OPERATED NORMALLY ON GROUND. FOUND MULTIPLE LOOSE SCREWS FOR DOORSTOP STRIP. TIGHTENED FASTENERS PER AMM 52-51-00.