Hi,
I just got the car back yesterday. They fixed a few smaller issues and also a bigger one (replaced front drive shafts as there was a strange noise/shake when accelerating with high suspension). With regards to our rattle issue, this is what the invoice said:
"isolated crossbars, checked toolbox still no permanent solution for this issue."
With the insulation the noise is a little bit less noticeable, but still very much there.
When I asked about a permanent fix, the engineer had no clue and said I would just have to wait... Very frustrating!
Rgds,
Jeroen