I've got a Kwikee Electric Step. Took the control box apart and two of the resistors on the board were burned. The step only works in short jerky moves in or out. Does anyone have a schematic of the board so the resistor value can be determined. Additionally, does anyone know where just the board (control box) can be purchased? Does anyone have a damaged step that was replaced and kept the old board (control box) they would like to sell?