As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECIEVED ECAM "DOOR L AFT CABIN" AND DOOR/OXYPAGE SHOWED DOOR 4L NOT LOCKED, FL390 APPROX 5HRS AT CRUISE, CABIN VERT SPEED AND PRESSURIZATION NORM. REPLACED PROX SENSOR PER A330 AMM 52-12. OK FOR SERVICE. (8992030) AIRCRAFT WAS GROUNDED.