I have been finding a fair amount of fluid buildup on the bottom of the cover for the front axle differential on the passenger side on my rs6. I know that leaks are common at the seal for the flanged shaft but the area around the flanged shaft is completely dry. Has anyone come across leakage from the axle differential cover. On etka, I do not see a gasket there but there is an oring on the inside. It is not coming from the prop shaft as I had replaced the seal a few months ago and it has remained dry in that location.