After abusing my 3 point hitch a few weeks ago, I noticed it has started drifting down when not running. It takes about 2 days to drift down. I got a post hole auger stuck in the ground and instead of disconnecting it I drove forward and dragged it out of the ground. I don't see how this could cause valve damage, but it is the only thing I can point to as a possible cause. I am guessing the valve is leaking by now. Anyone else see this happen?