Precor 9.33 treadmill Incline isn't working

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?
 
More info: was able to get the treadmill into diagnostics mode. The incline test sort of Passed? At 0 degrees, the AD read 20. At 15 degrees, it read 240. The AD value stepped as expected as the incline was incremented or decremented. Yet, the running deck stays horizontal.
 
Fixed. Bought a used lift motor assembly off ebay, precalibrated it per the service manual, installed it, done. It was the worm and tube that were messed up on the old motor assembly. The worm turned, but the tube thread was broken.
 
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