I dunno if Atma-Sphere does any repair work on amps that aren't their own, but if you don't get any answers here, it may be worth giving them a call. Maybe they can recommend someone.
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You might call Classe or email them...they might be able to help. I have found CJ, Zanden and Wilson to be extremely helpful regarding repairs which they decided after speaking with me were NOT necessary to ship the unit back to the manufacturer, and in some cases, even helped identify someone local to me who could help.