As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CHECK DOOR PRESSURE MESSAGE APPEARED ON FLIGHT ATTENDANT INFORMATION PANEL BY DOOR 1L. MAINTENANCE FOUND THE SERVICING VALVE ON THE L1 DOOR DAMPER AND EMERGENCY OPERATION CYLINDER LOOSE AND LEAKING. MAINTENANCE TIGHTENED THE SERVICING VALVE AND SERVICED THE L1 DOOR DAMPER AND EMERGENCY OPERATION CYLINDER PER AMM 52-10-00.