Horizon 5.3 Incline stuck

I have a Horizon 5.3T treadmill whose incline will go all the way to the max up but then won't come back down. On the motor control board I can see the upper left LED is constantly lit. I got a new incline motor from the mfr and replaced it only to discover that wasn't the problem. My guess is that it's in one of the control boards. I'm just not sure where that is controlled from - the upper controller or the motor controller. Any ideas?


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