Just noticed my wife her 2015 200s has 2 small spots where paint is starting to bubble on lip of hood just above the headlights. I know from having many cars with rust issues in my younger days what it is. Was it hassle free or was it really a pain the the ass to get them to fix. Our car was purchased used but should still be covered under the exterior panel rust protection warranty since that suppose to be a 5 year 100k mile warranty. Bu guess they could say its suppose to be a rust thru as I had GM pull that one on me back in the 90"s. Thanks!