On my 850 the switches simply pop out. I use a safety pin with the sharp end bent at 90 degrees, just the very tip. Then gently prod and pull from side to side. Do not force it. It has a retaining spring on each side.
Unless you spilled coke in it, the internals of the switch can not be saved. My very old Audi had coke, and I put the switch in hot water for 10 minutes and then hair dried it until it was hot to the touch and let it sun dry for a day. Miracle, it worked again. Usually they just get corroded and get replaced.
Klaus
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95 850, 88 245
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