L4300 hydraulic leak

I have a L4300 that is leaking hydraulic fluid. It appears to be coming from the driver's side below the engine where a still tube from the rear of the tractor makes a 90 degree sweeping turn into the side of the block/pan. It also appears that this tube is pressed into the block/pan as there are no bolts or connectors. I am guessing it either has threads inside the pan, or it is just pressed together.

How do I stop the leak?

Thanks,
Rodney

Okay, did a little more inspection. There is a fluid port or control valve of some sort directly in front of the hydraulic fluid filter. There is a short (approximately 6 inch) metal tube that runs from this directly into the side of the tractor. It appears to have a white rubber like substance around each end of this tube. The fluid is leaking from the tractor end of this tube.

It appears I have go remove this control valve, and disconnect the brake linkage, to access these seals. Is that correct?

So do I just disconnect the outlet block to replace the o rings?

Thanks!