Did you find the source of the leak, I had a leak in my back window which originated at the top of the back window migrated down the d pillar and into the boot here the nav drive cubby hole is.
I did read on another forum of another d3 that did the same thing, so it worth checking it by getting someone to flood the back window and boot lid area while you comfortably lay in the boot to check for leaks, take both cubby hole covers off from both sides as it will make its way to the inside of there if you have a similar leak to what I had.
If you do find that's the case then it's a window out job and reseal I'm afraid which cost me £40 quid as I stripped the back seats out and all the pillar trims and parcel shelf for access prior to the window guy coming to cut it out.
I was also lucky that the glass never got damaged.
Good luck
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