I have a 2015 Rubicon Unlimited with a 3.5 inch lift. I took it out on some trails this weekend and noticed a new oil spot yesterday. The rear differential has always had a small leak in the bottom left, but now it seems to have one in the top right, and in the welded plug? where the axle shaft meets the differential. What causes these leaks, and besides the fluid level, is it anything to worry about?