This does not sound like yours, but I thought I would mention it. I am not sure how to tell the difference between the soot and mold. I have no moisture, and I know how the soot gets in there, so I am not concerned that it is mold.
I have an 04 crescendo DP and the rear wall was not properly sealed so soot from the road makes its way to the upper rear corners of the back cap and into the intersection of the rear wall, side wall, and roof. The result is soot that essentially grows from the upper rear corners of the bedroom. The soot can travel along the intersection of the roof and walls and come out a bit later than the corner if there is a better exit for it.
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