rwood53 -
We too noticed a very, very slight discolouration on some areas, but not all, in our ceiling. They also appear in a straight line from side to side and are more or less equally spaced.
I first noticed this in 2010, a couple of years after we bought our Cougar but they have not gotten any worse nor have they spread. You have to look fairly closely before noticing them.
I believe the discolouration is caused by a reaction of some kind between the staples used to secure the ceiling panel to the roof structure -- very similar to rust. I think they apply some kind of filler to cover the staple and the reaction is taking place between the two --- like iron/steel in water so to speak.
I dabbed a bit of Kilz flat white ceiling paint on the spots and this helped somewhat. Now, they are barely visible.
In my case, the discolouration was not caused by leaks.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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