Is the problem end of life or the new processor?

Hello @mjm1951   Based on my history of older Classe components needing repair, I would buy new better amps.  Carefully chosen, they will sound better.  Looks like you keep things a while, which is great.  Buy new amps and keep them forever!  What is your budget?

I wouldn't write them off just yet.  Have them checked out/evaluated by a compentent repair shop.  It could be something easy and cheap to repair.  They could just need a good deep cleaning. (I'm guessing that they stood on or close to the floor for the majority of their lives.)  Even at 22 years old, if in good running order, they are nice amps. I have a pair of the CAM 200's that I'm in the process of refreshing myself.   Most of the parts are still available from Classe.

Where are you located?  I'm sure that there is someone here that can point you to a good service/repair shop close to you.

Amps can last a very long time IF the power supply caps stay in good condition.  This is why you read so many questions here about getting amps recapped, and 20 years is about the minimum age these days.

If you do have them recapped, ask for high temperature variants.  They last longer.