What was found
PILOT REPORTED UNABLE TO CONTROL PRESSURIZATION AFTER DEPARTURE FROM KYIP, RETURN TO DEPARTURE AIRPORT FOR MAINTENANCE. MAINTENANCE REMOVED AND REPLACED CABIN PRESSURE CONTROLLER OPS CK GOOD AT THIS TIME.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PILOT REPORTED UNABLE TO CONTROL PRESSURIZATION AFTER DEPARTURE FROM KYIP, RETURN TO DEPARTURE AIRPORT FOR MAINTENANCE. MAINTENANCE REMOVED AND REPLACED CABIN PRESSURE CONTROLLER OPS CK GOOD AT THIS TIME.