I've had the same experience, not quite the same costs though stlll steep enough. I'm not bothering to repair them as they'll only get chewed again. Apparently, it's soy or peanut oil in the insulation that could be attracting the foxes. It's happening a lot to other vehicles from what I've read online. It means that I can't move the gearstick from D to B to generate a bit more mileage. Nissan must know about this though - I wonder if they can be bothered to do anything about it though? A lady up the road has the same van and puts spikes under hers to deter the foxes.
