I haven't had to do this (yet) but it apparently is a common problem. I've read that it's preferable not to disassemble seat or window switches since they have a multitude of steel balls and springs which have a tendency to go every which way when you take a switch apart.

What I've read on the Ritter-Easley list is to liberally spray some electrical contact cleaner in any openings you can see on the switch and then move the individual switch many, many times (like 100) -- this may eventually clean up the contacts of the switch without having to remove it.

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Steve
'93 400E