I just had this occur Monday morning. Silverado that just broke 20k miles. Tech found a broken lifter and two bent pushrods. They replaced the entire bank of lifters, guides, gaskets, etc.. Not my normal dealer as I was on my way home from out of state, and while I caught them off guard on a Monday morning and they had no open service slots available, they got it right into the shop and had the work completed by cob on Tuesday. If they had taken longer, it would have saved me a day or two on the car rental. Otherwise, very happy with the service.
I will add, that ever since I picked the truck up new, it has had what I would call a lifter tic, usually at idle. I assumed at first it was because the truck didn't have premium, but it has always been present, regardless of the fuel used. That "tic" is no longer present. At least not that I've noticed yet.