Whine Underhood - 2003 Tahoe - Sounds electrical

[JWall]

Looking for some help with this whining noise in the video below.
It's on the wife’s 2003 Tahoe 5.3.
It’s an intermittent noise that sounds electrical to me.
To me, it appears to becoming from top of the engine on the drivers side.
No Check Engine Lights, No codes, No loss in performance & the noise changes little to none with RPM increase.
I’ve checked the common ground behind the passenger side head issue.
I also replaced the alternator & pcv with no effect on the noise.
I’ve seen others say they have this issue but no solutions for it. Thanks in advance!
(Sorry for the weird lighting videoed under a neon sign at night)


https://www.youtube.com/watch?v=tipV1Nuz8C8