Where can I get an owner manual for my 2012 Freightliner Cascadia

Where can I get a free owner's manual for my 2012 Freightliner Cascadia 125, it has a Cummins engine

 

I'm running under someone else Authority can I have my company name on the truck and the person that running for can there name also be on the truck I'm only talking about the name of their company and the name of my company, not my numbers, Basically I'm just want to know can I have to company names on one commercial vehicle

 

Have a 2012 freightliner Cascadia with a Cummins engine the VGT code is what the engine light was saying when I took it to the mechanic.... let me go back the engine light came on i pulled over I heard some noise in the engine like something knocking or it was like something breaking up, then it stopped the truck ran fine all except for over on the side where the DEF system is where it sounded funny along with the same side of the Turbo is on , it sounded different, the truck ran fine all except for that side sounded totally different, the mechanic charge too much to look into it any further so the codes that I have is VGT