As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS PANEL SHOWS CHECK 4L DOOR PRESSURE. MAINTENANCE FOUND THE L4 DOOR DAMPER AND EMERGENCY OPERATION CYLINDER HAD A GASKET LEAKING BELOW THE FRANGIBLE DISC AND LEVER ASSEMBLY. MAINTENANCE REPLACED THE DAMPER AND EMERGENCY OPERATION CYLINDER ASSEMBLY AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 52-13-14.