As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING ENGINES DURING MASTER CAUTION RECALL WE RECEIVED A FLIGHT DECK CONT CAB LIGHT THE LIGHT RESETS. GROUNDED - YES. PERFORMED PZTC BITE REF B737-900 AMM 21-61-00-760-806-002 #2 CONTROLLER FOUND FLIGHT DECK TRIM VALVE FAULT. PERFORMED FIM 21-62 TASK 832 FAULT RESET AND DID NOT RETURN WITH ADDITIONAL PZTC BITE AND OPPERATION OF PACKS.