All, Friday (21 May 2021) night my 2021 6.2 Trail Boss with 10310 miles on it, lost power and check engine light came on. My wife was driving home from work and got off the interstate on to a frontage road when it happened. When I started it up to see what was happening you could hear a valve tick (Passenger side bank). The more power you gave the engine the louder it got. And a nice plume of smoke coming out of the Tail pipe. GM towed it to the dealership. This morning (Monday 24 May 2021) they called and said a valve spring was broken and the push rod was bent. And they were looking into cylinder damage. They were going to take the head off. It wouldn't be until Tuesday afternoon before they could tell me more. The funny part was the dealer had to complete the service bulletin on the valve springs before i could take it home. They wouldn't even let me drive it until the inspection. I had to drive another vehicle for a test drive. When i finial took it home (4 days later) they said it was good to go. Ill post more tomorrow when I get an update of the damage.