Hi, it sounds to me like a relay of some type buzzing? I would see if you can remove the control cover to excess all component's, after you unplug it 1st, and then plug them back in and try and locate this buzzing sound? Funny, both are doing it? They have lasted a decade, and you have kept them up. Let me know if you locate this noise, and we can go from there.
Good Luck,Sincerely,
Shastalaker7
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