As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, AFT CARGO DOOR OPEN WARNING WAS DISPLAYED ON ECAM NO CABIN PRESSURE ABNORMALITIES WERE NOTED AND ACFT DEPARTED. ON ARRIVAL, AIRCRAFT WAS INSPECTED AND IT WAS DETERMINED THAT THE AFT CARGO DOOR SENSOR 32WV WAS AT FAULT. FAULTY SENSOR REPLACED, NO FURTHER ISSUES NOTED.