The shower skylight outside plastic cover on our 3400RL became cracked- we could not see it in normal use, but discovered it when we had the roof cleaned. The system has an outer clear plastic cover and an inner clear plastic piece. When I removed the inner cover I saw that water was getting into the coach through the outer cover crack. My experience with roof leaks is that the water stain often shows up in an area totally removed from the leak position.
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