Assisted hydraulic address box

Good afternoon, every time I have disappointed the adqusicion that I do, Nissan Xtrail 2003, first fuel the sound in the engine, then the overheating, then the cost of the spare parts and finally they have told me that there is a small leak in the box of the hydraulic direction.

In relation to this box, I call the consistent Nissan and have told me that it has a cost of $ 1900, that varvarity !!!!, they have told me that the box is sealed and there is no set of repair packaging.

Can someone help me, what can I do?, I have already spent demacious money, is there any remedy or way of fixing the leak?

The car cost me $ 17500 USD, and the spare parts that I describe are charicicicimos

head of head $ 100
piston rings $ 1147.96
Half moons $ 14
admission valves $ 214.64
Exhaust valves T30 $ 240
Distribution chain $ 232.10
Temperator and skates $ 132
crankshaft piñon $ 38.70
Water pump T30 $ 75 $ 75 $ 75
FONTAL COVER T31 $ 248.93
2 RETAINER CASH CHANG. $ 36

Look are almost $ 3700 without counting the address box and supports of the direction kneecars that come in a single set and there is no way to change only the label, you have to change the entire aluminum set This counts $ 280 each and there are two !!!