Wasn't "factory service" but I have had no problem getting servicing or repairs done on my McIntosh gear. There are several very reputable individuals available. The McIntosh amp and preamps I own are from the 1980's and early 1990's.
@sid42 I have a MC7300 which I have owned since new. Last year I sent it off to BobTheTechAudio.com for servicing for some minor issues and to have the bulbs replaced. I’m not sure he can help you but he is very knowledgeable and is great to correspond with. He kept me abreast of everything he did and recommended. He could advise you further.
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