For what it’s worth, I just got my truck back, they found a stretched chain and broken guide. This is the second cam phaser repair on this truck. First repair was with HL3Z and second repair just completed was with ML3Z phasers. It’s interesting that I only heard the noise 5 days before bringing the truck in. Looks like the damage was done quickly. I also noticed my truck idling much more quietly and feels more responsive. Everything covered under warranty thankfully. Let’s hope these last much longer.Not sure, they're just ordering parts right now.