As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4248 - CRUISE CONFIGURATION AT F. L. 20, AIRCRAFT LOST PRESSURIZATION. OXYGEN MASKS DEPLOYED, CREW CONDUCTED EMERGENCY DESCENT PROCEDURES. AIRCRAFT RETURNED TO FNT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AIRCRAFT AND DISCOVERED CARGO DOOR SEAL FAILED. NO PARTS AVAILABLE FOR REPAIR. PRESSURIZATION WAS DEFERRED. AIRCRAFT RETURNED TO SERVICE.