Here's the info on what the dealership will do if you take it to them Cummins 6.7L Turbocharger Cleaning

And here's how the Turbo works and why a cleanng or replacement of the Turbo without a change in how we drive the truck when not loaded won't keep the code at bay.
6.7L Cummins Turbo Diesel Basics

Cummins 6.7L VGT Exhaust Brake Operation

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10