As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE AIRCRAFT WOULD NOT PRESSURIZE AFTER DEPARTING ALBANY. CREW DIVERTED TO DAY AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND THE AFT CARGO DOOR NOT PROPERLY CLOSED. CARGO DOOR WAS INSPECTED IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL 52-31-00-220-801. AIRCRAFT WAS RELEASED FOR SERVICE.