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07 is250 engine noise. Engine squeak / squeal

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Recently I have been noticing a squeak /scribble noise coming from the serpentine belt area. The noise seems to get more noticeable when car idles lower or warms up and has been running. I have not noticed any leaks or overheating. I have replaced the idler pulley. Did water test on the belt and it does not make sound go away. Please check out vid and let me know what you think. 
Thanks !

Mileage: 158k


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