As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH TRIM AIR ON NO CONTROL OF CABIN TEMP. FOLLOWED QRH WITHOUT FIXING PROBLEM. SELECTED TRIM AIR OFF. UNABLE TO CONTROL TEMP IN ALL ZONES. ACFT GROUNDED. ACCOMPLISHED ZONE TEMP CONTROLLER BITES, NR 1 ZONE TEMP CONTROLLER. SHOWS TCV FAIL ON VERIFY, IAW MM 21-61-00-700-806-002. REPLACED NR 1 PACK TEMP CONTROL VALVE REF AMM 21-51-10-000-801. ACCOMPLISHED BITE TEST. PASSED. RAN PACKS AND LEAK CHECKED AND OPS CHECKED GOOD. TEMP CONTROLLER ABLE TO CONTROL NORMAL. GROUND VERIFICATION CHECKED GOOD.