As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LOSS OF PRESSURIZATION AND CABIN ALTITUDE EXCEEDED 10000 FT ALONG WITH O2 MASKS DEPLOY. MAINTENANCE R & R THE PNUEMATIC OUTFLOW VALVE AND MANUAL PRESSURE CONTROLLER WITH OPS CHECK GOOD. ACFT WAS APPROVED FOR RETURN TO SERVICE.