AU 5.0 litre power steering pump

[Edxr6]

Fellas,

I have some power steering fluid weeping around the top of the pump where the inlet pipe runs through the large nut. Is there an o-ring or two around this area, either around the inlet pipe, nut or both. Also is it just the case of undoing the nut to replace the o-ring? Any assistance would be great full.

Cheers