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if you drained the coolant then refilled it, u have to bleed the coolant system, if you dont bleed it, u could have a air pocket somewhere in the head where the coolant runs which will cause like a hot spot and warp the head. i dont think u have a blown head gasket, car is too new for that shit. and the only other way u can warp it is if you run it extreamly low on coolant or if your coolant fan isnt working. personally i dont trust dealerships with mech stuff, i do all my own work to be sure its done right. if they tell u that u need a new head and they want to fix it, take a marker and mark a spot on the head so when u get it back if the mark is gone, then they did what they said they were gonna do and if the mark is still there then u know they are bs. :) oh and they should only charge you for 5.3 hours of labor according to real time labor guide