There is a shop in Longmont, http://www.luddite-tek.com/, (Jeff, if I recall). Rebuilds audio all day long. My integrated-amp is going there this week for some R&R.
Another good source for used/good condition audio is http://www.recycledaudio.com/stuff.html. They have been around for a while and have some fun stuff. Don't look for bargains but solid performers.