I am working on a Clark NPR 20 and it has had a history of very intermittent loss of travel with no codes. Forward and reverse switches have been checked and replaced and the contactors have been checked no signs of sticking or welding. This truck has been in the shop twice now and several field service calls and I have been unable to replicate the problem in the shop. Any switch failure in the circuit has resulted in a code. My thought is the ground signal from the EVT 15 (EV 200) controller is dropping out but have been unable to test due to the lack of failure. Any thoughts or help would be great. Thanks RAF.