Isx 2350 help please!?

[Dynogt17]

How do I clean the carbon out of the EGR cooler? I checked the imap its clean and was first thing i replaced its maybe 25k miles old. As for the tune up. Ill do it again. But the sensors are less than 1 yr old. When the trucks running it sounds louder and like it has a restriction in the cab. I also dont get any codes or lights!

Thanks rawze and everyone i need the help.