Calling all gen 3 hemi gurus

I've had a number of lifter / cam failures in my patrol cars at work (5.7s) Chrysler has never acknowledged any "why", only that the lifters failed and (usually) wiped out the cam. They've always been under warranty, including one that had the problem twice. I would like to have done a little research as to which lifters (regular or MDS) failed; whether intake or exhaust; which cylinders, etc but just have not had the time. I send someone to go get the car and get it back into service. I don't know if Chrysler has the dealers documenting that kind of information back to them or not.