Good luck. I did the run around with three local dealerships for over 6 months before giving up on getting it covered under the powertrain warranty. They won't budge. Even corporate.
I would be willing to bet that most of the people who got it covered outside of 3/36K warranty received "good will" coverage (I haven't heard of any dealer who has covered it under the 5/60K powertrain warranty). "Good will" coverage is offered only to customers who already spend a lot of money at the dealership because they want to keep them happy. It doesn't cost the dealer anything because they still get reimbursed by corporate, and they keep the customer lining their pockets