We had a similar noise issue with our Whirlpool gold fridge. After numerous visits (over months) by the tech, turns out it was leveling of the unit and a metal plate on the bottom vibrating. A defect in the design of the metal enclosure I guess. He finally brought a foam insulation kit to do the repair. I believe the metal plate was on the bottom of the unit that was vibrating? Problem finally solved for us. Darn thing would make your teeth rattle with the loud hummm. Might be an avenue for you to look into for your fix. Also, when it vibrated, if you push on the fridge, it would stop or reduce the noise which made us think it was a metal plate vibration somewhere. Good luck
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