As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DECK CARGO DOOR OPEN (ECAM) IN FLT PASSING FL230 IN CLIMB. WARNING WENT OUT PASSING 10,000 MSL IN DESENT. RETURNED TO KMEM "MEL 52-71-01: (IDENTIFY) MCD DOOR CLOSED AND LOCKED INDICATION ON ECAM DOOR PAGE INOP. MTSI OPENED DUE TO PREV HISTORY. REPLACED MCD WARNING SWITCHES 48WS AND 49WS PER MM 52-71-11-5. CHECKED PER MM 52-71-11-5. OPS CHECK IS GOOD.