here's google link http://www.audibleillusions.com/contact-us/
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I also had an AI preamp, the best phono stage I ever had was in it. I sold it before ever having any problems.
If it's not warranty work I would try Ric at EVS.
He used to build those preamps when he worked at AI. He does not however have a very high opinion of Art and has some rather interesting stories of how Art acquired the company.