Hey, I don't think I have the skills or time to fix that for you!
Sorry. Hope the RS1Bs are doing OK.
If you were bridged mono you'd be using both channels, and something might be wrong with one if you are getting distorted output, sounds like it could be one channel not playing at all.
Don't replace the fuse and try again. You can bring it to John at NW audio in Seattle, that's the only place I know, not too familiar with Kirkland.