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Mackie 8 Bus noise - help

Have an older Mackie analog 8 Bus 8x2x2 board that has random computer noise occurring. Little 1/2 to 3 seconds of random frequencies, very low volume, but showing up on 1-2 LED segments across all 8 channel meters and the L/R as well. Definitely something internal to the board or external power supply. Not coming from any specific channel or inputs (have muted/disconnected everything.

A master test with a compo of mine

I'm looking for opinions on how better my mastering skill could be..
If you hear any defects in the frequency range, stereo field, levels, etc... Please let me know..
I could make it loader but made it at an LUFS of around -14db in preparation for youtube
The lead vocal is not definitive, (It might never be since I'm not a signer ;) )

Thanks