I just recently purchased the 700 SKS and I noticed the closest line to the oil pump which is the crankcase oil line will drain back to the oil pump. The other 3 oil lines stay charged with no problem. I changed this line thinking that maybe it was getting some air but after you shut the sled off you can still see the oil slowly draining back to the pump. I was thinking of replacing the main oil line and filter from the tank to pump next to see if it helps. Is this a sign that the pump is going bad?