Zumkopf

I知 still trying to eradicate that knocking I知 getting from the right rear corner when the car goes over even the slightest bump. It sounds like something on the hat shelf, and ironically when I pulled off the sunshade cover I found a loose piece of fiberboard on the steel underneath. But removing it didn稚 make a difference. Nor can I find anything likely in the trunk or underneath the car. I知 thinking that the most likely culprit is the upper shock mount. How do I get at it? I can稚 find instructions online or even a decent drawing. Thanks for any guidance.
Zumkopf
1998 A8Q 143k

2001 S8

If the sound sounds like metal on metal and it's just under the hat shelf by the C pillar, then yes it's the upper strut mount. I had the same issue, after I changed out my rear struts. The only way to get it/them, is to remove the rear strut.

The sound drove me crazy. Just a constant rattle/knocking.

Good luck.