Whining/squeaking on deceleration after 50k service at dealer, what could this be (video included)

https://vimeo.com/517401584?ref=em-share

Anyone got any thoughts here? I thought it might be the rear drums but that doesn’t seem to be the issue

 

Backing plate might have gotten smucked on the tire rotation.

It doesnt sound serious.

 

Ah well that’s good news. I just moved into an actual house and will actually have a place to Jack the truck up and check it out tomorrow as long as the weather holds out. Just figured I’d get some second opinions before I start tearing things apart.

Thanks for the reassurance!