Fiat 500L panoramic roof rusted through. (with pictures)

Hi my first post here. My Fiat 500L year of construction 2013 seems to rust the body between disk and panoramic roof. It started with the water from the ceiling lamps at the top in the middle, then I expanded the module, and one looks like the water from the Palatinate drips. It seems as if two panoramic roofs (that is fixed without opening) and the sheet zw disk and panoramic roof water stood up until it has found its way through the Palatinate. Has someone ever found its way through the Palatinate. something similar experienced with his Fiat 500L with panoramic roof? Currently I assume that windshield must be out, which probably breaks during removal and thus treat new, and then the Palatinate, and the rubber lip at the top of the roof renew to prevent re-entry. I tried to seal everything up, but some water can always still be pure. At parking Fiat 500L I have seen that at the panoramic roof the rubber is also left and right ng that this has to be a weakness, because as soon as water gets behind it it flows to the deepest point until it comes through there. But it can’t escape anywhere. Thanks for reading and I’m curious about your experiences.