Pull the engine number and call your local Cummins dealer. They'll be able to give you the warranty info. They can also plug the engine into their computer and tell you all kinds of stuff relative to the drivetrain.
Also, if you haven't done so, call Monaco direct with the last six of your vin, (you can also use your coach number which will be on the RVIA sticker near the door) They will email you the build sheet on the coach which contains all the installed stuff with serial numbers for your records and insurance.......Dennis