[Joe Bob]

I brought mine back to life by removing them......hooking up a 12v battery inline with a bulb. Vigorous on/off clicking with liberal use of contact cleaner.

If you get a clean on/off with the bulb then you have either fixed the problem or eliminated the switch as the issue.

Be sure you clip something onto the wire going into the panel as if you drop it inside, it a bvitch to retrieve.