ok, sorry for the delay. i found 2 issues that can possibly cause you grief,the servo burns "the actual control unit under the hood" or the vacuum lines are deteriorated beyond any repair and need replacement.to check the vacuum locate the servo and visually inspect all the rubber hoses going to and from the unit,you may also want inspect all the vacuum lines under the hood to prevent any unexpected surprises later down the road.a service garage w/ the capability to service cruise servos will have to perform the servo check,but you can check for voltage to and from the servo in case theres a remote chance that its an electrical issue,"i dont believe so,due to the lack many components".i hope this gets you cruisin soon.
Source: mercedes repair manual by haynes
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