Traditional Balance Controls are gone with the dinosaurs of stereo audio equipment.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Adcom-GFR-700-Receivers-manual/id/582dj599/t/2/
You may just have a speaker or speaker wire loose/failing. Swap them to isolate to an internal or external failure.
There isn't enough adjustment in the setup to make any channel completely silent.
Use test tones to diagnose it. Page 36.
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