Someone gave me a C330S Pro that had been left sitting for a considerable period. When I looked inside, ONE wall of the four of the area between the lens (and the light door) and the film was whiteish-gray, while the other three were black with a sort of felt look. I was able to brush away a layer of the whiteish-gray material, and that wall was black again, but not as dark as the other three, and the surface had the appearance of sun-dried, muddy earth, with irregular "cracks" throughout the surface.
The material on those walls appears to be somewhat gummy and pliable. I looked at another C330 body, and the interior surfaces in that part of the camera were covered with a harder, black material with a different type of surface.
When I shot a test roll, specks appeared on the prints, which, of course, turned out to be additional material that had crumbled from the whiteish-gray wall on the camera's interior. If you rub that side, your finger will be slightly black, so it's flaking off.
How can this be repaired? Is there another material that could, perhaps, be laid over the top of the deteriorated wall? I'm really curious as to what's going on there, since it was just the one wall -- the entire wall, not just a part of it. The other three walls appear completely unblemished.
Thanks!