Team AVI, Automotive Video, Inc., has released their updated diesel diagnostics training program for the Duramax 6.6L engine. In it, instructor Tony Salas covers the differences between the LB7 and the LLY versions, the scan tool diagnostics of each subsystem, operation of the fuel system, variable nozzle and waste gate turbo charger systems and much more to help techs be more profitable when working on these engines.