Welcome to NICO! I'm not all too well versed in your vehicle, but can offer an option for you.
Here at NICO, we have Factory Service Manuals (FSM) available free to members. Here's the link to the FSM for your car: Index of /FSM/G37/Coupe/2009
and for the 2012: Index of /FSM/G37/Convertible/2012
Hopefully between the two you'll find some of the information you're looking for.