As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER AIRBORNE, COCKPIT TEMP WENT FULL HOT AND PACK 1 OUT TEMP WAS 124 DEG STBY C IS OK. ACFT TO RETURN TO GSO. REPLACED FLT DECK TRIM VALVE. REPLACED FLIGHT DECK ZONE TEMP SELECTOR, ZONE TEMP CONTROLLER, OPS CHECK GOOD. PROBLEM RECURRED. REPLACED FLOW CONTROL & SHUTOFF VALVE.