One channel of my mcintosh 2100 amp needs a new pcb 043-899 but mcintosh is saying they may not be able to provide a replacement. If so any suggestions on how to get a replacement? Such as buy a 2100 for parts or have someone fabricate a new one from scratch? I would like to stick with my old 2100 instead of buying a whole (new) refurbished 2100. lizo: