As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN - FLT 5111 - 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 EMB-120 MM 21-30. SUBSEQUENT OPERATIONAL CHECK FLIGHT WAS SATISFACTORY.