What was found
CMH - FLT 990 - CMH-LAS - ON CLIMB-OUT, THE DOOR ANNUNCIATOR ECAM MESSAGE APPEARED AT 6000 FEET. AIRCRAFT RETURNED TO CMH LANDING OVERWEIGHT WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND AFT CARGO DOOR HANDLE UNLATCHED. MAINTENANCE ADJUSTED HANDLE LINKAGE PER AMM 52-31-11. OPS CHECK GOOD. VERTICAL SPEED WITHIN LIMITS PER AMM 05-51-11. OVERWEIGHT INSPECTION NOT REQUIRED. AIRCRAFT RETURNED TO SERVICE. (M)