They spent a whole day and a half fixing the hatch. test drive's and more fixing, etc. They nailed it down to two sounds. Metal clanking from the rear cargo retractable slip cover. Removing it removed the metal sound. They felt taped the plastic on the back of the lower hatch area per a bulletin from tail light to tail light. They also adjusted the two hatch stops located on each side per the bulletin for a more secure latch.

Sound is 95% gone, you can still hear a tiny bit of flex, but now I am really listening for it.

2009 X5 4.8i