Sending pre in for service, need volume controller

Thanks, everyone. It's looking like it might not be too painful after all. I can make an appointment, overnight it to First Sound and be music-less for maybe 3-4 days, tops. I was thinking it was going to be longer, but Mr. Go seems to think it's just a simple toggle switch replacement, as the other inputs work perfectly. It's only the right channel on the main input that cuts in and out.

Appreciate all the help.

Buconero, don't know what a "Chase RL box" is, but it would have to be pretty spectacular to improve upon that First Sound passive.