At a glance
What can fail
The U-bolts connecting the rear axle to the suspension may be defective, allowing the axle to slide on the leaf spring and causing poor handling and potential loss of control.
What the fix does
Mercedes-Benz will mail you a notification. Take your vehicle to a dealership to have the leaf spring U-bolts replaced.
Summarized — see the official notice for exact wording, dates, and contacts.