Try putting a strip of Gorilla Tape across the top of the rubber moulding. Hopefully that will stop the leak. It might not be the windshield and could be inadequately sealed clearance lights on the top of your cab. If there's an overhead cabinet you might be able to tell if water is leaking from above. They can also be sealed with Gorilla Tape.
Since your rig is new, this is a warranty issue and you don't want to do too much to it. Gorilla Tape is only a short term solution and is easy to remove.
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Bob C
2002 Itasca Suncruiser 35U
Workhorse Chassis
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