a very strange thing has happened to my96 9k. a sizeable dent has appeared in the centre of the roof above the front seats.all the rigidity has gone from the panel.Ive read this can be caused by a head on smash but can find no evidence this has ever happened to the car.a bodyshop suggested a support bar in the roof may have failed/come away. is this likely ? .the headlining looks like a complete B to remove so any advice would be welcomed before major surgery is undertaken....