Blowing audio/nav fuse, all out of ideas!
 

Hi All, I have a 2008 XC90 which has been a great car until recently. Driving along the nav and radio suddenly cut off. I checked the fuses and saw that F5 under the steering wheel was blown. I replaced and all was well, until I drove over train tracks and it blew again. Now it blows either instantly, or after driving a short time.

The fuse is responsible for:
4/120 Parking Assistance Camera module (PAC)
16/1 Integrated Audio Module (IAM)
16/16 LH window antenna amplifier 1
16/46 Multimedia display
16/94 Infotainment Control Module (ICM)
16/105 Audio Module (AUD)
16/108 Multimedia Module (MMM)
16/109 DVD player/control module
54/112 Connector, cable harness infotainment, extended D-feed

I figured it was a loose connector, or rubbing wire, but have not found anything after removing all of the mentioned modules and checking as much of the wiring as I can.

Anyone have any ideas? I am beyond fustrated at this point!

Wiring manual for reference: http://www.volvowiringdiagrams.com/v...%20Diagram.pdf