As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKEOFF COULD NOT MAINTAIN FLIGHT DECK TEMPERATURE. DUCT TEMP RANGED ABOVE 160 DEGREES BELOW 70 DEGREES. RETURNED TO DFW. REMOVED AND REPLACED FLIGHT DECK CABIN TEMPERATURE SENSOR (AALA202211289589) PER AMM 21-61-10. PERFORMED PACK TEMP CONTROL BITE AND FOUND FLIGHT DECK TRIM VALVE FAULTY. REMOVED AND REPLACED ZONE TRIM AIR MODULATING VALVE (AALA202211283024).