Hoping I can find some help on a sound issue

OK, this will be complicated. This is the address of the AudioBook Mastering paper.

https://forum.audacityteam.org/t/audiobook-mastering-version-4/45908/1

Scroll way down into the Noise section, mosquito whine. Download that custom filter, open it and read it in a text editor.
The job of that filter is to suck away tones starting at 1Khz and working up in even numbers.

That’s the filter you need adapted to your frequencies/tones. I’m not a programmer and I can actually follow that.

Effect > Nyquist. Put your new program in there. I’m not on a computer, so that’s about all I can do for now.

Koz