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 MASTER CAUTION RECALL. RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. FOUND PZTC 2 FAULT FLT DECK TRIM VALVE. CW B737-800 FIM 21-62 TASK 832 FAULT CLEARED COND CABIN ZONE TEMP LIGHT NO LONGER ILLUMINATES ON RECALL.