Cummins can't say for sure , but they suspect it was from a injecter problem --feeding too much fuel.
i had the bosh 300 injecters in (same injecter as the 275's) , they said the cumputer is unable to tell when too much fuel is being fed to the cylinders with these injecters. ?? Also have the small edge box.
Never beat on the truck , strict maintenance program. Having a hard time justifing this one (second time)