Holden Captiva 2012: Exploded sunroof

I have a 2012 Series II Holden Captiva LX diesel, which has done 32,000km. I have had a company car for the last 10 months and the Captiva has been in my garage for this period of time. I took it out for a run a total of 4km and left the car outside on a warm day and the sunroof proceeded to explode on the vehicle. I have my vehicle in at Holden as I write this trying to get them to cover it under the 5-year warranty that I have on the car. I am afraid that they will come back saying that it is not covered, as it was my fault. I have been quoted around $2000 to replace it with a non-genuine one, so as you can imagine that is a lot of money. Do you have any suggestions or recourse that I could take back to Holden should they not honour the warranty claim?