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 ILLUMINATES ON MASTER RECALL AND RESETS. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 21-62 TASK 801. FOUND FLT DECK TRIM VALVE FAULT. REPLACED ZONE TRIM AIR MODULATING VALVE PER B737-900 AMM 21-61-21-401, OPERATIONAL CHECK GOOD. NO FAULTS FOUND. GROUND VERIFICATION SUCCESSFUL.