I have one shock I can't get to quit leaking. I built them as vented per the instructions. Been running the truck for about a year and about a month ago one of the rear shocks started putting oil out of the top vent hole. I figured the cap was bad so I put a new cap on rebuilt it and when you compress the shock, oil comes out of the top vent hole. None of the rest of the shocks do this? Maybe the bladder??