As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O CONT CAB ZONE TEMP LITE ILLUMINATED. RAN QRH AND ZONE TEMP LITE EXTINGUISHED. GROUNDED - YES. PER B737-900 FIM 21-62 TASK 801. PERFORMED BITE OF PZTC. CONTROLLER 2 HAD FLT DECK TRIM VALVE FAULT IN HISTORY. PERFORMED VERIFY A COUPLE TIMES. EACH TIME PASSED GREEN.