Doug, thanks for your reply. Thats the most helpful things I've heard about this problem from anyone.
To be fair, the service department has been great to deal with and very open about all the steps they've taken. It was their idea to get in touch with the factory rep for guidance and I've spoken to him as well.
They've run a running water test, a high pressure water test and the interior pressure check that you described and they are unable to replicate or locate a source of the leak.
Thanks for the tips on the slide topper. I have to confirm with them about the slide awning this week so hopefully I can find out more.
