As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START AND MASTER RECALL PUSHED CONT CAB ZONE TEMP LIGHT ILLUMINATED, RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. #2 PZTC LOGGED CONTROL CABIN TRIM VALVE FAULT. RESET FAULT. SEVERAL CONSECUTIVE BITE CHECKS PASSED. OBSERVED VALVE DURING BITE. NO BINDING OR DEFECTS NOTED. REF B737-900 FIM 21-62 TASKS 832 & 801.