Well, don't know if this will help, but the problem I had with power steering fluid leaking turned out to be the high pressure pipes somewhere in there seeing some weather and getting ever so slightly perforated. The part has been uprated by Nissan, and it's been fine ever since.
Might have been 12 & 13 down to 15 from this diagram? (random Google image search, so may be completely wrong!) When Steve @ Falcon showed me the goosed bits, it certainly looked like a bit of a spiders web of pipes anyway!