As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3314 DURING CRUISE FLIGHT AT 35000' "DOOR L AFT CABIN " ECAM MSSG DISPLAYED. CABIN VERTICLE SPEED WAS UNAFFECTED.FLIGHT ATTENDANT REPORTS DOOR WAS CLOSED AND LOCKED, DOOR PAGE SHOWED 4L DOOR UNLOCKED. CORRECTIVE ACTION: MSG ALREADY CLEARED, T/S C/O. NIL PRESENT FAULT. (4877868)