First, you will remove a whitish (ours was crudded and discoloured) plate which holds the switch in place. This plate is attached by two philips head (NON-STAINLESS) screws.

Both of the screws in our unit, in keeping with the planned obsolescence that anything you buy in the US are known for, were both totally rusted. This, after a single year of ownership! One had to be removed with vice grips. The other removed after cutting a notch in the head and unscrewing with a flat blade driver.

After removing the cover, note the position of the switch and the two wires with blade connectors. Replace the switch with your new one. Clean the plastic thoroughly... especially the ice port. Ours was filthy (the design sucks, allowing splashing liquids back into the port).

I re-assembled and replaced both screws with 4-40x3/8" stainless steel pan head self-tapping screws. They'll never rust, but the same can't be said for the rest of 'em.