Hey All! I’m looking to purchase a 2002 460DA with 650hrs on Cummins 480CE engines. Boat is a one owner freshwater boat very well taken care of other than the owner said the aftercoolers have never been serviced should this be a concern? What is the recommended service intervals on the aftercoolers? The only known problems that showed up on survey was fire extinguishers out of date, no flare kits onboard, and the port engine vibrates boat when put into gear until you bump the rpm up maybe 25 more rpm then smooths out. Any and all info would be greatly appreciated!!