Automatic Transmission Internal Gears problems of the 2019 Subaru Forester

The contact owns a 2019 Subaru Forester. The contact stated she turned on the vehicle, left it on and exited to close the trunk, but after forcefully closing the trunk, the vehicle began to roll backwards. The contact stated the gears was set on park and the area was an inclined driveway. The contact stated the vehicle knocked her down but was not injured nor needed to seek medical attention. The vehicle continue to roll into the woods and detained by a tree stump. The vehicle was not drivable. The contact towed the vehicle to an auto shop and was being service at the moment. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 27,000.