Probably the light strip in the door, I had this on my 8 and 8.5, if you push the tips of your fingers underneath onto the actual light bar itself the noise will probably stop, on my 8 I carefully pushed a small piece of loom tape up beside the light strip using a small screwdriver, whilst being careful to not add too much, that stopped it, on my 8.5 just pushing on the light strip did the trick.