As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT ILLUMINATED ON MASTER CAUTION RECALL. GROUNDED - YES. C/W FIM PROCEDURES & NOTED FLT DECK TRIM VALVE FAULT LT ON - ZONE TEMP CONT 2 BITE. ON GREEN GO LT ILLUMINATION AFTER VERIFY SW DEPRESSED FLT DECK TRIM VALVE FAULT RESET. OPERATED R & L PACKS WITH NO FAULTS NOTED ON BITE TEST OF #2 ZONE TEMP CONTROLLER. REF B737-900 FIM 21-62 TASK 842 & 801 & AMM 21-00-00.