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 MASTER CAUTION RECALL. GROUNDED - YES. INITIAL EVALUATION, CONFIRMED DEFECT, CONT CAB ZONE TEMP LIGHT ON MASTER RECALL. PERFORMED PZTC BITE IAW B737-900 FIM 21-62 TASK 801. PZTC #1 HAD FLT DECK TRIM VALVE RED LIGHT ON BIT, CLEARED ON VERIFY.