NEED HELP 06 LT Coupe

[mbfit001]

Anu sugguestions on how to fix the key stuck situation?...I think you guys probably know what I am talking about, so I wont bore you with the details. I just want to know what to do on how to fix and what exact part is needed. Thanks

[Rman]

Does the key turn all the way back to the off position? And is it an original key or a copy?

[YelloEye]

Dealership, there's a TSB on it.