Hey There....
Contact me directly at odav@odysseyaudio.com , and I'll get you a host of options....Essentially, the amps are somewhat modular, meaning that it is very easy to exchange boards, with pretty much only the RCA post being soldered. I can send upgraded boards, already set up, tested, and biased for you, ready to just drop them in. Shouldn't be more than 20 minutes tops for an exchange, and even if you feel that you don't want to touch electronics, it'll be easy for any technician to do so.
This way we don't have to send the heavy cases back and forth, and it will be very economical....
Late,
Klaus