Nissan Patrol 4x4 (Africa)

Hi all. I need some advice on a vacuum pump oil leak. I noticed a leak on my td42 vacuum pump. I bought the 2 o rings from Nissan. I installed them but about after 5 min of ideling the motor i saw the oil is not leaking where the o rings is but on the pump itself. I asked Nissan if i can open the pump but they said No. Is this true? I heard that is posible to open them. If not does anybody know where i can get one? The one at Nissan is very expensive. Thanks.

Dawid Volskenk sal hê, kontak hom

There must be a way to open it up and replace a seal that must be leaking. The leak cannot be from much else...