Ayre MX-R upgrade costs?

I would contact Ayre's Michael Wiedmair

I e-mailed Michael recently because I thought it odd my AX-5's volume would cranked down when I put it in standby mode (turns out the behavior is as designed). I found out that Michael is now doing sales and that customer service is now handled by Gary Mulder who worked at Ayre years ago.

I got quoted 15k which seemed a bit steep

Certainly not cheap in a vacuum but a good deal relative to buying a new pair, no? I've used Ayre's upgrade service before and I am a big fan of not having to buy a whole new unit to get the latest and best performance. In the case of the MX-R Twenty, I vaguely call reading a post by Charles Hansen saying that they pretty much replace everything except for the chassis and, maybe, transformer.