Hi all. 2021 Highlander Hybrid Platinum AWD @ 62000 miles. Rear differential was serviced at 39k miles. 4 days ago I heard a weird noise pulling out of my garage. Wondered what it was but didn’t have time to play around and listen. Thought maybe it was just brake and rotor noise. Today I was able to go under the car and listen. Sounds like my rear differential is producing a whine. I took a video of the noise, and I will say it’s a bit louder in the video than it actually is in person. Unfortunate for me, I just passed the powertrain warranty.. yay! Any ideas what I’m hearing and looking at in terms of repair? Taking it to Toyota to diagnose is $190. Should I wait for it to get worse? Is it something else? Should I get to Toyota ASAP? I’m a bit lost..