mornhm - FSO
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Somewhere there was a thread about my (and other's) thumbswitch and the contacts being pitted. From my experience, the next stage for pitted contacts is "welded" contacts (where the two contact surfaces actually are stuck together by a weld created by the arc when the contacts close or try to open).
Bottom line, check your thumbswitch also. Look at the surfaces of the contacts they should be relatively smooth and shiny.
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