Just picked up our new Matrix 670sc. We discovered last night that the roof light above the rear bed has no seal and I could feel cold air blowing in. The same roof light above the galley area has a rubber seal all the way round. There is a slot in the rear one for a seal but it's not fitted. After a bit of googling it seams you can get the same roof light as vented or not vented. Is it normal for one of them to be vented? The dealer has said he will order a seal anyway and I'd rather have it with one.