Mitch Singerman in LA might be someone worth calling. He does repairs on lots of different gear. If he can't help you he probably could give you other options.
The best place in town is George Meyer's in Santa Monica. They are authorized repair for Krell and McIntosh, but do work on everything else. They have repaired Mac and Classe amps for me, and I'm waiting on a classic Mac 1700 receiver right now. They take their time, but they do a good job and are very reasonably priced.
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