how can I fix my Proform XP 590S Model 831.29506.1 Treadmill?
my Proform XP 590S Model 831.29506.1 Treadmill is approximately 4 years old. The incline is raised and stuck so that when you turn it on all it does is jumps, like is is caught in an incline command position. It just sits their lifting and pounding down. I have not used it the past year +.
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