Rear Suspension Springs problems of the 2016 Ford F-150

Tl-the contact owns a 2016 Ford F-150. The contact stated while driving at 20 mph there was a abnormal loud rattling noise emerging from the rear of vehicle. There were no warning lights illuminated. The vehicle was taken to a independent mechanic where informed that the leaf springs were detached and causing the noise. The local dealer was notified of the failure. The vehicle was not diagnosed or repaired. The manufacturer was notified of the issue and informed the contact that the vehicle was not covered under a recall or warranty and referred the contact to NHTSA. The failure mileage was 42,000. Ap.