As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: THE AFT LEFT CABIN DOOR WILL NOT STAY ARMED. ITINTERMITTENTLY SHOWS ARMED & UNARMED OR DISABLED ON THE ECAM. T/S L2 DOOR PER AMM 52-13-00. CLEANED DEBRIS ON LOCKING HOOK, ARMED AND DISARMED LEVER, LUBRICATED, NO FAULT FOUND.