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Yesterday I replaced my valve cover with one from Rein, on startup it began making this exact sound, though only below 800rpm. A minute before I found your video I discovered the humming from the airbox, and when you I saw you resolved this issue by replacing your VC, I was obviously a little distraught. In a last ditch effort I popped the cover over the PCV diaphragm, hoping that was the issue and I could just swap it with the one from the old VC. No such luck, but after reseating the diaphragm and putting the cover back on, no more noise. I have no idea what did the trick or if it was just a fluke, but just figured I'd share my experience in case it helps someone else!
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