This is what I do for a living since 2010 for a Chrysler dealer. Lifter rollers fail and seize up causing damage to cam lobe. Problem is all that metal has to go somewhere. First thing we do is remove intake manifold and remove and inspect the oil control valve. If it’s full of metal we don’t go any further. It will require a new engine. We are unable to properly clean and remove all of the metal debris from all the oil passages for the VVT system. Yes I know everyone’s Uncle Bob at the machine shop can fix all this real cheap but that’s not how it works at the dealership level. We have to be able to honor or workmanship or parts at another other dealership nationwide.