All five of these leaf switches operate on 5 volts at a very low current. Therefore, pitting of these switches would be extremely rare. Probably the only reason that pitting would occur is in very high-humidity locations.
Don't burnish the switches. Burnishing them removes their plating, thus increasing the corrosion of the contacts. The best method of cleaning the switch contacts is to wipe them with a non-abrasive surface. A business card works very well.
To replace any switch, remove both of its screws with a Phillips-head screwdriver—see Figure 8.
If the white button itself needs to be replaced, turn the stamped nut with a wrench in a counterclockwise direction, as seen from the inside of the control panel. The white ring on the outside of the control panel should not spin, due to its design.
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