03 MDX Radio display but no sound after re-initializing with code

After replacing battery, had to use the "secret code" to restart the audio system. It accepted the code and the radio powers on and all
displays and controls work, but there's no sound. This is the Bose CD Audio/Cassette package, plus the Rear Entertainment System with DVD. I can't find any fuses out, and fear it might have slipped into some sort of mute mode related to the RES. Anyone ever heard of this?
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