What was found
FLIGHT 633, PHL-LAS: AFTER TAKEOFF FROM PHL, CREW WAS UNABLE TO CONTROL THE COCKPIT TEMPERATURE. THE LEFT PACK WAS SHUTDOWN, AND TEMPERATURE CONTROL WAS REGAINED. CABIN BEGAN TO CLIMB WITH LEFT PACK OFF. FLIGHT DESCENDED TO FL 260, WHERE CABIN STABILIZED. DUE TO FUEL CONSIDERATIONS, FLIGHT DIVERTED TO PIT. MAINTENANCE REPLACED THE OUTFLOW VALVE, RAM AIR DOOR ACTUATOR AND CLEANED ALL CABIN TEMP SENSORS. NO FURTHER FAULTS.