When I command the incline Up, the motor runs and the treadmill does incline a little. Command more incline, the motor runs, the incline doesn't change. I took off the cover and can see the motor worm turning but the incline doesn't change. Is it likely the plastic thread inside the tube stripped? There are no error codes on the display. Also, if it needs replacement, it looks like I would have to buy the whole incline motor + tube assembly?