I believe the servo is limp when it is not activated. It is possible that a bad servo caused the cruise amp to fry but from what I understand it's not very common. If you get a new amp it wouldn't hurt to get the servo checked too.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold