I took my 2009 C63 AMG to dealer for a clunking noise past last month notice in front axel when turning streeing wheel to eith side and backing up making circle trun. They told me this how it and there is no remedy exists. They give me a bulletin number "LI33.15-P-047471" with no details. Does any one knows how to access this bulletin board and what is this about. I contacted MB via email and hasn't heard from them. I am not convinced if this how MB designs their car. Any help is apperciated.