Thanks for coming back and posting the solution.
Most questioners here do not post what the real answer was.
You've saved me, and maybe one thousand others, the six months of torment you went through.
A true and strongly voiced
Thank you
From me.
(using the sound meter on your phone as a sound snooper mighta let you find the problem in a minute. It still can't find the whistle in my damn f150, but it's found plenty of other rattles. I drive, spousal unit marches or rolls a round looking for noises. An errant metal mug was driving us nuts.
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