We did get a limited number of parts, (which we have since sold to Mojo Musical Supply, (800) 927-6656) and most of the circuit schematics for them, many of which are available on our web site: http://www.music-man.com/techinfo_old/ .
There are no authorized service centers. For repair purposes, it would be best to find a qualified amp repair technician, preferably one familiar with these amplifiers.