As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED PRESSURIZATION FAILED IN-FLIGHT. PILOT SET EMERGENCY PRESSURIZATION. TROUBLESHOT SYSTEM, FOUND A/C VALVE FAILED. REPLACED A/C VALVE, SYSTEM CHECKS GOOD. THIS UNIT REQUIRES INSPECTION EVERY 600 HOURS. OPERATOR AAIP HAS THIS VALVE ON CONDITION. RASMARK JOGA.