Before you go replacing the switch, invest about $10 in a can of Contact/Control Cleaner and Lubricant from Radio Shack. I don't really know what this stuff is, and the label is no help, but it works like a charm on the finnicky MB switch gear. Get the switch out far enough to be able to shoot some of this into the holes in the plastic housing, wipe off the excess and you may be good to go. I have used it on several sticky/nonfunctional switches, including mirrors and seat controls, and it really works.

Good luck,

g

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64 230sl, my daily driver
94 E500, sold
98 E320, family and dog hauler
04 C240, safe machine for teen drivers, but a poc
08 audi a4, yes we have gone to the dark side