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I'm not hearing anything definitive...sounds normal or possibly a bearing...belt noise comes across as a harmonic...a vibrating rubber belt...it's clumsy and audible as a wooshing sound especially when it's hot...the sound seems crisp...it's easier to discern giving it some revs..
. A flutter;belt...a whine;bearing...loosen the belt by 5 hertz and see if it changes

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