I've been collecting this stuff for several years, but I haven't had to seek repair. I've got a few minor annoyances I'll eventually get to but I'll have to seek someone out too. A local store here in Seattle (Hawthorne Stereo) used to be a dealer for Kyocera back in the day. Perhaps they have a lead for someone familiar with this brand. Good luck. That is a rowdy amp, I'm sure. Hope you get it happy again.