As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CABIN ZONE TEMP ANNUNCIATOR ILLUMINATED ON MASTER CAUTION RECALL. EXTINGUISHES WITH PUSH-TO-RESET. GROUNDED - YES. PERFORMED PACK TEMP CONTROL BITE TEST ON ZONE TEMP CONT 1&2 PER B737-800 FIM 21-62 TASK 801. FOUND FLT DECK TRIM VALVE FAULT ON ZONE TEMP CONT 2. PERFORMED VERIFY TEST ON TEMP CONT 1&2. FAULT CLEARED.