Refer to section 8.3.10 Removal of the Flash P.C.B. of the Service Manual. Only the portion of Fig. D14 dealing with replacing the switch unit is applicable to this repair - there is no need to dissipate the E.Capacitor or remove the Flash P.C.B.

With the Top Unit removed, you gain access to the rear wheel switch itself. Start by removing the two top screws on either side of the wheel.

Next, pry the wheel assembly from its mount using a small, flathead screwdriver on either side.

Flip the switch over and disconnect its ribbon cable.