Welcome to NICO! Sorry to hear that your car is having trouble. 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 http://www.nicoclub.com/FSM/M/2007_M45-M35/
Hopefully you'll be able to find the info you're looking for.