REL Strata III repair issue

My REL Strata III bit the dust. It started to blow fuses so I sent it to REL in CA for repair. To my surprise, I was informed that one of the amp's boards has suffered trace damage and cannot be repaired. They found a complete replacement amp module and are offering it to me for $500. Seems excessive to me. My question to you guys is whether there might be an alternative replacement amp for this subwoofer, or whether it might be possible to have someone else repair the damaged amp.

Thanks in advance.