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Here is a few links to a youtube on how to clean the EGR on Cummins 6.7: https://www.youtube.com/watch?v=caOXszIo1X0 / https://www.youtube.com/watch?v=Z-AIBD7x9_k / https://www.youtube.com/watch?v=UrBt7soKSwY2016 2500 w/ 6.7IL6
Does the EGR system require cleaning? Removing the EGR cooler/EGR valve, etc....
My son's truck has ~140K mile on it and am reading about this maintenance.