Rowland Model 5 Parts?

I am in the midst of a repair on a Rowland Research Model 5 power amp. The problem was that unit was operating on safety. (Power switch cutting out after 10 sec. or so.) The defective part - after extensive investigation - was found to be a pre-amp module serving one channel. Have spoken to Jeff Rowland and he claims that such is available and that he would get back to me. But no news in nearly a month. Anybody know where I can find one?