I have a 172 Mkii seven months old and there is a rattle coming from thr rear! Took it to Rno dealer and they said it was the rear centre belt from the roof. that is not the case. does anyone have any advice? It is driving me mad. it is nothing to do with reving or engine speed. you can go reakky slow and it will still make a noise. it is like plastic knocking. it is driving me mad!!!!!