Yes, I've looked closely at the ladder mounts and added silicone to the two upper ones. Also, since we have been having afternoon t-storms, I taped a black 42 gallon trashbag from the roof down over the marker lights and window. Yesterday, we had 2 inches of rain in 45 minutes. Dry, the trash bag prevented the water intrusion. Next, I've only covered the window to see if the leak develops. If so, it's the right hand marker light. That would be the easiest. If no leak with a decent hard rain, then no doubt it's the window seal. I'm attempting to get information from Lippert on what seal they use in case I need to replace it.