After a long delay getting the special order part it was installed yesterday. I haven't spent much time with the car other than to drive it home from the dealer but the high pitched tone coming from the speakers is significantly less if not gone. Will confirm.
Looks like the part was a receiver audio module P/N: 65 12 7 928 577. This part is apparently located in the rear cargo area.
Last edited by gofast182; 11-15-2019 at 09:30 AM..
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