VTL ST-85 Repair

I have a 2002 VTL ST-85, which has of late been blowing the main fuse (6A, slow-blo). Rather than bring the amp to my local dealer (who would be happy to look at for at least $150), I'd like to have a go at repairing it myself. (As background, I'm an EE with some analog circuit experience.)

Most books I've found covering tube amp repair are written for guitar amps, not stereo amps, though I'm sure the principles are basically the same. As some may have already discovered, VTL is extremely restrictive about who they'll send documentation to - end users of their equipment don't qualify.

So, I'm looking for suggestions of good titles covering stereo tube amps, or perhaps specific suggestions regarding my particular problem.