Yes Koldness (#1post), it has been a while since your post but I'm with you brother. I have the exact same creaking sound which started at around 38K in my 2011 SL. About 3k miles later, it is now really creaking. Along with the continuous dash board creaks, the CVT trans noises and the clattering valve train, the car is driving me bonkers. Have you had success with the re torque of that component and did you also lube things? I will be looking into that area you mentioned as I am not familiar with the exact underbody component you are talking about. Thanks for the information.