Hopefuly someone can help me, I have a PE-4500 AC with an intermittent problem. When traveling in either direction in high speed traction cuts out and message on the display reads return to neutral,Ive replaced pot and f/r switches and still the same,what i noticed though is when powering the machine on and going therough self test the line driver contactor doesnt pull in. But will pull in when requesting lift or traction but like I said start driving hit the high speed switch it gets to a certain speed and displays that msg.