As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMP IT ILLUMINATED WITH MASTER CAUTION AND THEN IS CANCELED WITH RESET. GROUNDED - YES. ACCOMPLISHED PACK TEMP CONTROLLER BITE TEST. #1 CONTROLLER TEST PASSED NO FAULTS. #2 CONTROLLER SHOW 1 FAULT FLT DECK TRIM VALVE. RESET #2 CONTROLLER RAN BITE CK AGAIN NO FAULT TEST PASSED. PUSH MASTER CAUTION NO FAULT LIGHT REF B737-800 AMM 21-61-00-700-806-002.