Just want to add one more thing. My friend who had an unrelated engine issue on his MB, which required the MB mechanic to remove and replace the air intake tube from the turbo, discovered after, that even MB didn't think enough to change it out. The issue with this part is material fatigue. So, if you think a MB mechanic is any better, think again. It's very dealer specific, as to if the guy is knowing and skilled or not.
The swap out of that part, during your fuel filter maintenance, takes all of 30 seconds. So buy a new one and eliminate any issues down the road. For those who don't feel their mechanical skills fit the bill on this service, just be informed is all I can recommend.
That is interesting that MB would not formally document the issue to help JLesing with his claim. Silence on the issue speaks volumes. What puzzles me is most who think MB, think their premo. To a degree they are. But, ponder this, what do Germans buy at home, chevys, fords, nope. So, perception can be puzzling sometimes.