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Noise of air leaking near the spark plugs

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Good morning, my subaru legacy 2008 3.0R has a noise of air leaking on the side of the driver's side, next to the spark plugs. I changed the spark plugs and did a compression test, and everything was normal, does anyone know what it could be?

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Is the PCV hose located on the top of valve cover on the EZ30? They tend to get brittle with time and crack. Could be that?

A mechanics stethoscope with a funnel on the end may help narrow down where to look. Or a rolled up piece of paper held to your ear if you want to be really old-school.

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