I serviced the NordicTrack ViewPoint treadmill in Brunswick, Maine.  The belt needed to be lubed and adjusted and the treadmill needed to be cleaned.

I also had an issue with the belt surging, slowing, stopping, then speeding up.  I checked everything out before cleaning and lubricating the belt and deck.  After lubing the problem appeared to go away.

This was an older, but still nice non-folding NordicTrack treadmill.  I liked the large rollers and the 3HP continious duty drive motor.