Hi all: I live overseas and they don't have Vs here, so looking for knowledgeable advice. Just had an oil change done on my '12 Vagon and the shop noticed oil/grease on/around the rear diff. See photos below. Last had the diff oil changed a couple of years ago, so this is not from a recent change. Based on the photos any ideas on what exactly may be leaking, or at least where I should start looking for a leak location? I only do very basic wrenching and am dealing with language barriers at the shop as well as no V expertise locally (though there is a Cadillac dealer) so I'm out of my depth here. Thanks!