For the bevel gear: http://home.ripway.com/2005-4/294125/Volvo/V70XCBevelGear.pdf
Search the forums for xc70 problems to make sure you do everything to preserve the health of the 4wd system. It is a little fussy if you don't maintain it well.
Your car has a low pressure turbo, i think. As for the T5 it is a floating hydraulic bearing type turbo, using engine oil for lubrication. The leak is probably where the oil return line connects to the oil pan. You simply have to change the o-ring.
good luck
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