Been chasing a roof leak for a while. First seemed to be some old patches that had failed, cleaned off and redid. Seemed to work. Then leaking again. Seemed to be around the fan, recaulked and seem...
The web site has links to shops that have the equipment. If you're really industrious you can try and make your own fan system.
The test will point out EVERY leak in the coach not just the roof. Windows, door, slides,,,, The test is the same as a blower door test you would have done of a stick and brink home as part of an energy audit or HVAC evaluation.