Each switch, individually became very stubborn requiring several pushes before operating. During the same trip, both switches stopped working, individually and together. Unless both switches feed into the same relay, it just seems odd that both would malfunction at the same time. I'm picking up a pair of new switches today for $70 at a local MB parts supplier. Hopefully that is the problem.

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1991 560SEL (254K miles)
1980 Lincoln Mark VI - Givenchy
1979 Lincoln Mark V Collector's Series
1979 Lincoln Town Car Collector's Series
1979 Ford "Effie" Pickup (in gradual transformation to a show/street truck)
1969 Lincoln Mark III (waiting for "Overhaulin" to call)
1989 Lincoln Towncar
2001 Lexus GS300 (spousal unit's daily driver)