As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP CONTROLLER UNABLE TO MAINTAIN TEMP FLIGHT CREW MODULATION TRIM AIR TO MAINTAIN TEMP. PERFORMED TASK 21-51-14-705-075, PACK TEMP CONTROLLER BITE FOUND LT TSMP COND VALVE FAULT, TESTED GOOD. BITE TEST ZONE TEMP CONTROLLER. AUX ZONE TEMP CONTROLLER TEST OK.