TADAC repair?

Any information on anyone performing repairs on the TADAC (TAD DAC by the late Paul G.)? I have an intermittent situation that needs looked at on my TADAC. I performed web searches but to no avail.....suggestions appreciated...Thanks
I didn't know he had passed. I loved his pre-amp.
He was a very nice guy and extra helpful.
Sorry. No suggestions.
I also did not know that Paul had passed. I have two of his TAD 150 Signature preamps which I love. He was a great guy. RIP