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Hi Phil, my 4000 has the same problem, it's common I guess.
I think they had rubber inside that deteriorates so spray probably won't fix them.
They are fairly ordinary I think except they have taller buttons than most, I would bet there's something in the Mouser catalog that would work with a little adapting.
I recently found this circuit board from a GE Refrigerator that has five small switches, I was going to see if I could make them work, they have fairly tall buttons on them but I don't know if the lead spacing is right or not.
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