2024 Mercedes-Benz E-Class Suspension

I’ve been hearing a creaking noise in the rear when coming to a stop. Independent mechanic inspected it and said the subframe was severely rusted and that I probably should not drive long distances until it is fixed. They researched and said others have had similar issue. Mercedes apparently is aware and offers an “extended warranty.” I have an appointment in two weeks (!) to have it looked at by a Mercedes mechanic. They will pay for the repair/replacement IF warranted. Should be a recall, IMO. Can’t imagine that the part in question, which according to my mechanic, “essentially holds the back of the car together” wouldn’t be an immediate recall. Car has 120k miles on it.