In case this information could help any one!
My Kwikee Step on extention would not shut off, it would keep attempting to open, banging aginst the stops.
I deduced that the large gear had a broken tooth and could not reach the point that the limit switch could stop the motor.
I adjusted the stops on the step to enable the step to be stopped before the gear reached the broken tooth and it worked. The step now works like it should. Altho I do need to open the gear assm and rotate the gear so the broken tooth is not envilved.