Looks like known problem, here is the sib

Si b66-09-09

Knowing the sib, where do I go to find out the fix for it?

Never mind, although the car is now gone I was still curious so payed the 24 hour access fee to bmw tis.

As I thought, exposed wiring going into left hand side tailgate at site of rubber grommet. The defect is very small and just needs insulating tape to fix.

I can post PDF if it will help someone else, just not at moment as on my ipad.

[ATTACH]Attachment 62420[/ATTACH]