Just got my van back from Camper Medic. When the guy that was recovering the cushions and panels took a panel off he found a spongy part in the wall. Jon from Camper Medic inspected it and found there was water ingress from the window. He agreed to replace the panel and reseal the window. The last photo shows the new panel in place and its like new. The streak is just a reflection. I cant recommend them enough, it's a really good job at a very good price. Thanks Jon