1300w PSU humming loudly

I have had this rig running for about a year.  I don't know if it's just started to grate on me, or whether this has been going on for the whole time, but I've had enough...I'm pretty sure it's the PSU that is humming (could be "coil whine"?) non-stop...under all loads.  It sounds like an old-school refrig right under my desk.  I'm seriously going to lose my hearing.  Turning off the workstation is like stepping into a quiet room.

Is this "normal" with these units?  Anything I can do?

NOTE: I have replaced all the fans in this rig with Noctuna's and they're running quiet.  I do NOT think it's the PSU fans, but I suppose it's a possibility.

Appreciate any tips/tricks/ideas for my sanity! :)

Happy Holidays all.

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