Well, looks like I have the dreaded unbonded windscreen. Only just bought the car, 2009 V70 D4, and just noticed water dripping off the light. On checking looks like someone has tried to seal along the top with silicon sealer but it's pulling away from the screen. Just had a push at it and it moves all along the top. Looks like the origional screen going from the markings. Need to see what my local Volvo dealer says.