As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED CABIN AUTO PRESSURIZATION SYS OPERATED ABNORMALLY ON DESCENT. CREW LANDED ACFT UNEVENTFULLY. MX REMOVED AND REPLACED ELECTRO-PNEUMATIC OUTFLOW VALVE AND PERFORMED OPS CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.