Why on earth anyone takes a 7+ year old car to a dealership for servicing is beyond me, when there are specialists out there who will do a much better job for half the price and not try and sting you for every minor issue!

I did my first 2 minor services with the stealership that sold me the car (AHG), each one costing over $1200, bear in mind if work FIFO so I had only covered around 4k between services... It's been to STechnic ever since and the price has been around half the dealership's, and they won't fix shit that they know you can do yourself!

If you have an AHG warranty you'll probably find the disclaimer which states that consumables are not covered, gaskets are considered a consumable I believe, hence why they won't cover it. I had the same issue when a minor gasket went on mine.

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Ryan