As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN, PILOT REPORTED THAT THE CABIN DID NOT PRESSURIZE UNTIL 10,000 FEET. CABIN MASKS DROPPED AT APPROXIMATELY 8,000 FEET CABIN ALTITUDE. MAINTENANCE REMOVED AND REPLACED THE AUTO TEMP CONTROLLER. OPERATIONAL CHECK ON GROUND GOOD. REFERENCE MM 21-30. SUBSEQUENT OPERATIONAL CHECK FLIGHT WAS SATISFACTORY.