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The cruise control amps (box under the dash) is the most common failure. They are ~$150 for a rebuilt. Some folks try "resoldering" the old ones, but that seems to work better on older ones (W116, W123) and not so much on the newer ones (W124, W201, etc). Your actuator (on the engine) could be bad as well but it's a lot less likely. The amp is pretty fragile electrically. All of my cars either have a rebuilt unit installed or need one!
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