Though I'd post an update. I picked up the amp on Saturday. Vince said he had it running, it sounded great and over the course of pretty much an entire day never once shut off. He said it's possible that the speaker wire I had was too thin, or frayed somewhere, etc. So, I bought some better speaker wire, and haven't had any trouble so far (knock on wood). Also, he didn't charge me anything. I was expecting to pay something, like an evaluation fee or something, but it was free.
So , while I didn't really get anything repaired there, I came away with a pretty good feeling about the place.