Having a problem with a 20IR30TT serial 020D-93-34790. When the lift goes into plugging mode the lift will not move forward or reverse and brake will not come on to stop the lift, even when foot is taken off the dead man.. Turn key off and back on to reset and it will work for a while. Intermittent. I replaced the handle assembly, Rec 3, scr 1, all bad contact tips, electrical control card. Any sugestions would be a great help. I have been chasing this for a long time.