Hello, I have a John Deere 5300 and the scv s on the back will leak down, within 5 mins a cylinder will leak Down around 5 inches. I put a gauge on a quick connect coupler and the pressure is 2800 psi and immediately drops as soon as I let off the joystick, within 2 minutes pressure is at 500psi and sorta holds better with less pressure. I removed the whole valve assembly and took the two spools out and all the plugs and cleaned, I didn t see anything wrong. The pressure relief valve had some small pieces of metal in it, removed all of it and reassembled the valve and put back on the tractor. No luck still doing it. Any suggestions?