As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMP LIGHT ILLUMINATES ON RECALL EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED PZTC BITE REF B737-900 AMM 21-61-00-700-806-002. PREV FLT LEGS SHOW A FAULT FOR THE FLT DECK TRIM VALVE. FAULT CLEARED UPON VERIFICATION. GROUND VERIFICATION SUCCESSFUL.