As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON EXT FINAL TO MEM RECEIVED AN ALERT INDICATING THE MAIN CARGO DOOR WAS OPEN (B-LOOP). DOOR WAS VERIFIED CLOSED BY FIRE/RESCUE PERSONNEL AFTER LANDING. RELEASED FOR SERVICE PER MEL/CDL: 52-40-01-06 CATEGORY: B EXPIRATION: 29MAY04 MEL 52-40-01-06: CARGO DOOR UPPER B ALERT INOP. VERIFY DOOR IS CLOSED AND LOCKED PRIOR TO BLOCK-OUT. REPLACED CARGO DOOR PROX SENSOR IAW MM 52-70-06-2. OPS CHECKS GOOD.