What was found
AFTER ENGINE START, CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED. THE LIGHT CLEARS WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED BITE TEST ON BOTH TEMP CONTROLLERS. FOUND # 2 CONTROLLER FLAGGING CONT CAB TRIM VALVE. DID NOT CLEAR. REMOVED CONT CABIN TRIM VALVE ELECT CONNECTOR, CLEANED AND RESEATED. RERAN BITE. FAULT CLEARED.