L I F E T I M E P O W E R T R A I N the cam is part of the powertrain...

If the dealer reneges, then tell the service manager you want to set up a meeting with the regional service rep.
Stealerships prey on those who do not know their rights. Had a problem with a new Furd once, dealer refused to fix an engine issue with 14k on the truck because I "modified" the truck with a cat-back exhaust. I had my atty send a letter that mentioned Magnuson/Moss and the dealership then stated that I must have "misunderstood" them, that of course it was a warranty fix...