Hi David,
I'm glad to hear that DAC has withstood the test of time for you and it sounds like you truly enjoy the music listening to it. Your DAC came before my involvement in the company, but our policy is not to leave our customers hanging and I'd be happy to work up some options with you tailored to your needs.
Why don't you drop me a PM and give me an idea as to what you might hope to accomplish.
We've had guys upgrade the digital pcbs, dsd modules, capacitor swaps, output stage tweaks, added outputs, etc. and I'm sure we could work something out to keep you enjoying for several more years to come.
Fred