As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK ON RECALL CHECK, ZONE TEMP CAUTION FOR CONT CAB ILLUMINATED. PUSHING MASTER CAUTION RESET EXTINGUSHES THE LIGHT. GROUNDED - YES. REMOVED AND REPLACED FLIGHT DECK ZONE TRIM AIR MODULATING VALVE REF B737-900 AMM 21-61-21 OPS CHECK GOOD.