Im just relaying what Ive read. It seems that on the 6.0's, you can flash it back to stock and the dealer or whoever else will only see a "soft code" which means your check engine light wont come on but they will see it with a scan tool. This code is also the one that is set when you unhook your batteries. Most say you can just tell them you unhooked your batteries and they cant prove that you did otherwise since the tune is gone. Now you, me, and everyone who works at a dealer will probably know 90 percent of the time when someone comes in with a blown headgasket and they see this code, what really happened. Whether they choose to invistigate it further is up to them. I have read that they could send the ECM to ford and they can do further research but I dont see them doing this. I also know that if your truck is driveable, you can return in back to stock and put a few miles on it and the code will automatically reset itself. So, if I was in a situation where I needed to take it back in after something hapened and it wasnt dead, I would reflash it to stock and drive it a few days. I am not saying this is the right thing to do as I dont think ford should have to pay for something you blew up with a 125 +over stock hp tune. I am not the law however and people will do what they want. Good luck.