I can't quite give you Detriot, but Randy Fay in Windsor Ontario often crosses the border into Detroit. He's a professional amp builder and I'm sure he can also do amp repairs. Randy's handle on this site is ontariomaximus, and you can get his e-mail off his posts, such as in this thread, http://www.18watt.com/modules.php?name= ... c&p=209390
He also lists amps on eBay, such as this one - http://cgi.ebay.ca/Phaez-T-Style-Custom ... 27ad969085
That should give you enough information to get in contact with Randy.