Rear end leak

[Tparker4]

Trying to figure out why I’m leaking read end fluid from rear end all of a sudden. Where axle tube meets pumpkin. The bolts are all tight. Is there a gasket in between axle tube and rear end? 2015 express S4

[cybercart]

i think there is a inner seal in there if so it may be leaking, instead of opening it up ive seen people clean it around the seam real good with brake cleaner and seal it with hi quality permatex all the way around