Well, it still makes no sense, as our generators don’t generally need to be removed and sent off to be serviced.
I would read your warranty information thoroughly, and perhaps call Jackson Center and the service department there to see what they have to say, should you not find a simple solution to your leak.
Removing it and sending it off seems unwieldy to the point of maybe being a deterrent to having it serviced under warranty.
If that is some agreement between Airstream and Cummins, it should be reduced to writing somewhere in your warranty information.
Plus, these are big and heavy and shipping them back and forth seems to carry its own risk of damage.