Hello m00n.
I'm obviously the new guy here. My post volume is a little funny but I'm dealing with a very similar issue so I thought I'd chime in for what it is worth. I have a thread started about my rsw-15. Turns out my active speaker has a open so it is shot. I'll probably be purchasing a new one from Klipsch.
In my troubleshooting I learned the BASH amps are no longer available. However, there is a place in MI called Sybesma's Electronics that is authorized to repair these amps. I hear they have done many of them and the cost is about $250. Anyway, if you need to go down the amp replace/repair road, you might give them a call.
Best of luck,
Brett