Wiring problems of the 2013 BMW X5

My 2013 BMW X5 35d was in motion on a city street, when it stalled, lost all power and ultimately would not restart. I was able to get it to the side, but not off the road and it was towed to the BMW dealership where they discovered that there had been a still unidentified sourced, fuel leak into the electrical harness and finally pooling into the dde component, frying the dde component to failure. There was enough fuel in the dde component that it was drained into a drip pan and fuel covered the wiring connection points as well as had discolored the wiring. I was informed that had this been a gas engine and not diesel, it would have probably caught on fire as fuel was able to access and travel across the electrical wiring in the car. BMW has refused to help in anyway to investigating the reasoning for this happening and or any repairs that would be involved as they "do not have a financial responsibility because the car is no longer under warranty" I feel that this is an opportunity for them to discover the reasoning without the destruction of evidence that a fire would have caused and they are choosing not to do so as to claim ignorance to the safety issues that this happening represents.