Welcome Reyucel,
I have an EP600 with a bad amp as well. After a quick e-mail to Axiom, they confirmed it could not be repaired. They kindly offered an updated (most current) replacement amp for a fraction of what the entire sub would cost.

Shawn

Epic 80/600 + M3's + M3 Algonquins + M2 Computer + EP125
I think I'm developing an addiction.