As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX- AIR TURNBACK - FLT 752- AFTER TAKEOFF, ECAM MESSAGE AFT CARGO DOOR APPEARED AND THE AIRCRAFT WAS RETURNED TO PHX. IN PHX MAINTENANCE INSPECTED THE AFT CARGO DOOR TO ENSURE IT WAS FULLY CLOSED AND LOCKED, WHICH IT WAS. THE AFT CARGO DOOR INDICATION WAS PLACED ON MEL 52-70-01 COND .7 AND PLACARDING PROCEDURES COMPLIED WITH. AWAITING FURTHER TROUBLESHOOTING.