High pitch squeal coming from rear end

[Dropsix]

Noticed this the other day - 2014 Sierra crew cab standard box, limited slip and 3.42 gears. It doesn’t always do it and mostly seems to do it when turning in a parking lot. However, one time I heard it pretty good going straight at low speed (also in a parking lot).

 

any ideas??

[Dropsix]

No one eh! Figured someone else might have had this problem. Off to the dealer I go!