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Need Help with a noise at high speed..

I have a 2017 MS 75d with 80k miles on it. lately I have noticed a humming sound (more like a high pitch Bass) from Rear which starts at 67mph and increases up until 75mph then the road noise covers it i guess. I have extra set of wheel and tires which i did swap in the rear just to see if it was the rear wheels/tires. All four tires are fairly new. swapping did not work.
Could it be the Wheel Bearing or the DU itself? Any suggestions would be greatly Appreciated.

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