I don't know about D2, but Defenders, and I know my son's D1 XD has tubes which run from the axle breathers to a high point.
If you're seeing evidence of oil slung from the center of your rear wheel hubs, outwards, that's a pretty good sign your breather fitting, or tubes, have become plugged. The steel fitting that goes through the banjo, into the axle casing has a tendency to become plugged with rust, from condensation. Clean the area around the fitting with a wire brush, and blow any dirt/ residue away, before unscrewing the fitting, to prevent crap from falling into the axle housing.
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