As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP CONT CAB ON RECALL. GROUNDED - YES. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE PER B737-800 FIM 21-62 TASK 801 SHOWED FLT DECK TRIM VALVE FAULT BUT VERIFY TEST DID NOT CONFIRM FAULT. PERFORMED CABIN TEMP CONTROL AND INDICATION OPS TEST PERB737-800 AMM 21-61-00-700-807-002. ALL TESTS PASSED.