I have the same problem of amp on one of my AM180. The other already had problems with a hp cable that was bumping on the woofer, my local dealer is 250km from home which makes the interventions complicated. I own the famous ELAC ELT7 for years. They were stored because they were replaced by the AM180 and their ribbon tweeter.
I am dismayed that spare parts are no longer available. With such dubious reliability, we can speak of planned obsolescence. ELAC, when a breakdown is recurring as this forum seems to attest, This is a design flaw. What solution do you offer to your loyal customers?