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 RECALL RESETS WITH MASTER CAUTION PRESSED. GROUNDED - YES. REMOVED AND REPLACED THE CONTROL CABIN ZONE TRIM AIR MODULATING VALVE ASSY. OPS AND BITE CK NORMAL, NO LEAKAGE FOUND. REF B737-800 AMM 21-61-21.