Anyone have any theories on why diff fluid would be leaking from the breather tube vent? I just drove 2 hrs at 65, temps 5 to 20 F. When I pulled into the garage I smelled the fluid and found fluid dripping from between the front and center skid plate. I estimate there is 1/4 to 1/2 a cup, but will not know for sure until I pull the fill plug. There are no leaks from the drain or fill plugs, both axle seals are dry and there is no leak where the front drive shaft enters the diff. Both breather vents are not stuck or frozen in either the up or down position. My personal belief is the vent is defective and a new one will solve the problem, but I thought I would run it by everyone here for other opinions.