Troubleshooting Rega Brio-R Amp Issue

I lost sound in my right speaker and replaced the cable, but still have no sound in the right speaker. That same cable works with the left speaker, however so this is striking me as an issue with the amp. I have replaced the fuse in the amp and am stumped as to what to do/try next. Any thoughts or insight is greatly appreciated.

The system is a Rega RP1, Rega RS3 and Rega Brio-R using new Kimber Kables.

Thanks in advance.