As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN TEMP CONTROL IS UNCONTROLLABLE. SUPPLY DUCT TEMP IS 58 DEGREES IAW QRH, COCKPIT COOLED AFTER LT PACK OFF. ACFT GROUNDED. PERFORMED BITE TEST, REF FIM TASK 21-61-00-700-806-002, OF PACK/ZONE TEMP CONTROLLER NR 1. THIS PACK TCV FAILED BITE TEST. R & R LT PACK TRIM MODULATING VALVE WITH SERVICEABLE UNIT, REF AMM 21-51-10/401. OPS CHECK/LEAK CHECK GOOD AT THIS TIME.