I had a similar problem with a small pesky leak. I tried everything I could think of. Water "creeps" and can run for several feet before finding a place to exit. I would clean the roof, remove virtually all seals I could find, and reseal every joint, light, etc with a professional quality lap sealant, or in the case of marker lights, some silicone. Iggy's advice was good, if there is a low spot near a seal, water will get in.
Also, the dealers find leaks by closing all doors windows and vents, then mounting a high output fan in a window to pressurize the coach, then spray soapy water on all of the seals. I found my leak at a marker light this way.
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