As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5652 -PRES- CREW REPORTED HEARING A POP AND CABIN WOULD NOT PRESSURIZE. THE FLIGHT DESCENDED TO 10,000 FEET AND CONTINUED TO ATL. NO MASKS IN CABIN DROPPED. CORRECTIVE ACTION: FOUND UPPER POSITIVE PRESS RELIEF VALVE WITH INSULATION STUCK IN IT, REPLACED VALVE, CABIN PRESSURE CONTROLLER AND PRESSURE SEAL AT AFT P-DOME APU BLEED DUCT. PERFORMED HULL LEAK CHECK PER AMM OK FOR SERVICE.