It operates normally, after I cleaned the upper & lower limit switches, but there's a wire disconnected inside the drive unit. I think the wire should connect a Torque Sensing switch at the rear of the shaft, to the sequencer board. There's what looks to be a diode coming from the board, with one loose end that might be where the wire should go. I really don't want to chance blowing the board by experimenting. Does anyone know for sure about this wire? Thanks.