I thought that might draw some attention.
No not us ( wood where is the wood ),on Caravan Talk there have been one or two posts regarding damp in Unicorn 3's on second and third services:-
Caravan Talk U3 Damp
This seems to major around the off side rear corner and it has been suggested that it could be caused by condensation on the Alde pipework under the laundry bag in the wardrobe rather than water ingress.
Whether it is or not is anybodies guess but it might be an idea to keep an eye on things in this area.
I checked ours today and all seems OK but I don't have a damp meter so it was visual only.
£20K plus for a caravan and we are still checking for leaks,you couldn't make it up.