Sorry, can't help on a service resource in the Boston area, but I hope it works out well. It would be a shame if they have to be retired due to repair/refurbish cost.
Let us know how it goes.
Is the problem end of life or the new processor?
My Classe Cam 350s are starting to have problems. One was running fairly warm & I noticed the Aerial speaker it was powering had a small tear or the glue had failed at the bottom woofer. I disconnected it while to speaker bass driver is being replaced.The other 350 has started to go into protection mode periodically. Is this just end of life at 22 years or something else? The only thing recently new is replacing my pre-pro with a Marantz AV-10. All the cabling seems undamaged.
Happy to receive any thoughts as I try to decide repair vs replace.