As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATED AFTER ENGINE START. MASTER CAUTION RECALL AND EXTINGUISHES UPON MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED FLIGHT DECK ZONE TRIM VALVE WITH SERVICEABLE UNIT IN REF TO B737-900 AMM 21-61-21.