Kubota M4900 auxiliary valve is leaking hydraulic fluid. I accidentally hit the control arm of my remote valve. It stuck on while there was nothing hooked up to it. Mit started leaking Hydraulic fluid. It looked like the cover on the bottom may have had a seal or gasket on it. I removed it's and it just had a spring and a set nut. On further checking I found it is leaking from midway of the housing. Is there a gasket or seal? What is the best way to get to it? It only leaks while tractor is running. What's the best any to get to it? Thanks.