Well the best time to find a leak is when its raining....raining today so all furniture out, lines of silicone sealant to localise the source and away we go ....Pool of water used to appear occasionally and soak the carpet so today I set about finding it . Was not coming from roof , traced it to the trauma water heater base ..watched it dripping in from back of unit...went outside ,there was a run of water beading down from the side window to the top of the trauma vent but not coming out the bottom so all off.. cleaned up the fascia and lots of silkia and screwed it all back on ..yippeeee no more drip and now drying out ,then furnishings back. Beer to celebrate. Worth checking all exterior van vents and fixtures...as the wood base to the heater was somewhat rotten with wet ,how many years had this been weeping ? .Anyway the thought of how much I saved by not taking this in to a dealer for investigation has made my week ! excellent. :thumb: