Midnight,
It's a one piece cover. Real easy fix. Remove the plastic Cummins cover, 4 bolts, to reach the valve cover. You can either torque (22ftlbs) down the 6 bolts holding the cover, or remove it and check the o-ring type gasket and clean it and reinstall. Or, take it to the dealer and let them deal with it. About a 40 min job tops. Your warranty should cover it.
Mike