Kenwood KM-X1 Buzz in one channel

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It's a 6 channel amp hooked up to an AV pre/pro. One channel developed a buzz which changes in frequency a bit (like a mosquito). Switching to a spare input/output on the amp ;makes it go away and isolates it to that individual input/output. I think it's a great amp. Wanting to determine problem and fix. Possible bad leaky cap? Looking to find out what to check first. Thanks
 
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