classicaudio.com Located in Carmichael. Tim Whyte used to repair vintage equipment. Not sure if he still does. If not he probably knows who does.
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Try here: http://www.irebuildmarantz.com/.
Click on restorations and your model will come up listed with others. There is a step by step tutorial for your model as well as having them do it for you.
I believe he is located somewhere in Northern California. He used to work in Southern California for one of the major studios (Disney? Warner Brothers?) back in his salad days.
All the best,