Having same issue with multi function switch. There are two plastic tabs on inside of front plate by the shaft of the switch. Push both tabs in and knob will come off. Two screws under knob hold switch in place. I noted wire routing and pulled mine out to get part number. FZ31-9E, 11 pin, 7 position. No luck finding one anywhere. Anyone tried the 12 pin 8 position and if so, which position should not be used?