I have a problem with the terrain tracer system on my Tr86 It just all of a sudden won't level the head when lowering the feeder house. It tilted to the left and won't move at all. We checked the switches and diodes etc, but no luck. The top valve on the valve stack has 2 hoses coming off the side of it to the feeder house tilt cylinders. The back hose has pressure on it all the time. Seems to be something inside the valve sticking. I've been having trouble lately when lowering the header it tilts to the left, even with the electric header control turned off. Got to be hydraulic problem.