Active Subwoofer Dead Channel

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I have a KRK RP10s active subwoofer, and it has some symptoms that I have never seen before, though I wouldn't say I have much experience with this sort of thing.

First off, the right channel is dead. If I plug in the left channel, sound comes out and it works, right channel does nothing.

Also, when the left is plugged in so I can get sound, if I turn the volume knob up past half, sound cuts out. I checked the volume pot with a multimeter and it seems to be working fine.

There is no clear burns or anything on any of the boards or components.

Any ideas??? This is driving me nuts.
 
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