Leaking remote outlets on JD4240.

Friend has a JD4240 with leaking remote outlets. All seals, receptacles, etc have been replaced. It leaks when the tractor is not in use and there is no pressure. I have had this problem with a number of models of JD's made in USA. Is there any seals that are better than JD parts. This tractor has ISO couplings. JD couplings have a similar problem.

My tractor does the same. I just put a piece of cardboard on the floor under them.

Ok, I have this problem with my Kubota products. What I have found is that if you put a quick disconnect fitting with pipe plug in the end it stops the problem. IE no hose connected just a plug in the fitting.
Mark