Your searching abilities are quite evident... I think you have resurrected every P/S post in existance!
There is a library here somewhere with the .pdf FSMs, but for whatever reason I can never find it! If phatg20 is down again, that's your best option for getting one other than just paying for the $20 one day subscription at
http://www.nissan-techinfo.com/infiniti
You definitely need the FSM before digging in to replacing that pump.
That said, it's relatively rare for the pump to fail. I think you should get a mechanic's sthescope like this to track down your engine noise you mentioned when turning the wheel to the stop. It is more likely a tensioner than the pump...
Heath