Conlux NBU-2262-13B Upgrade?

[rescue161]

I have a Conlux bill validator that I've had for a few years.  I got it brand new and it has only seen use in my house, so it is in great shape.  I'd like to upgrade it to accept the newest 10 and 20 USD dollar bills.  It already accepts the new color 5's, but I have not done anything to it.  I got it in 2005-ish and put it in a homemade Cherry Master that I put together for fun.  Well, years later, I still enjoy the machine, but it is starting to be a pain to play because the older bills are becoming scarce.

Any upgrades other than buying a new DBA?  I see that MEI bought out Conlux.  I did try calling them, but got nowhere.  It's a 24V up-stacker with a separate motherboard unit that sits beside it, if that helps.

Thanks!