don't let him have Marshall service it - apparently they 'bring it up to modern safety standards'. in other words, replace the original mains and impedance selectors and also the bulgin mains socket. this has a negative impact on the value.
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Well the guy who looked at it has apparently been at Marshall for years and says that he was there when the amp was made and that everything was fine. To my knowledge the amp hasn't been over used and has been sitting in the studio for years. I used it for bass years back but most of the younger players these days either take their own amps or DI.Next time I am there I'll take a picture.