Hatchback/liftgate Support Device problems of the 2010 Buick Enclave

Tl - the contact owns a 2010 Buick Enclave. The contact stated that after opening the rear lift gate and leaning in to put something in the vehicle, the liftgate dropped down without any warnings impacting the contact's head. The contact did not sustained any injuries that required medical attention. Prior to the failure, the contact had received notification of NHTSA campaign number: 15v415000 (structure). The vehicle was taken to the dealer. The technician made the contact aware that the software update listed on the notification was not yet available and diagnosed that the struts needed to be replaced. The manufacturer was made aware of the failure. The vehicle was repaired. The failure mileage was 83,200. Pm.