I'm seeing some differential fluid on the concrete under my 2013 Wildcat. It looks like it might be the left rear axle seal in the differential. There's also some brown stuff near the boot on the right axle. If I were to replace the axle seals, is this an "on-vehicle" repair, or is it necessary to remove the differential? Or maybe it's not the seals that are leaking (see photos). Thanks again for any advice.