This controller module solved my problem, although it required some modifications. The connector that goes to the brake wasn't the same as the connector on my original controller so I cut the connector off the old controller and connected the wires to the new controller. Also, the black plastic case didn't have mounting screw holes in the same place as the original. So I took the new control board out of the new case and put it in the old case. Once assembled, the scooter works great.
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