I have a Vigor CS, OS 70, JR 10X and G550T gyro. Problem is with the GV-1 governor. After spool up and the governor takes control everything seems OK. I vary headspeed with Aux 4 and governor off/on with Aux 2 switch. The only way I can get the governor to disengage is turn Aux 2 switch off. Throttle hold switch appears to work OK when engine is not running, but does not work at all after GV-1 takes over. Lowering throttle/collective stick also does not disengage the GV-1. I need advice