Re: Or would the airflow be too weak or too strong?
you have to ask how they found the leak in the Soyuz a while back.
That one was apparently caused by an inaccurate drill hole, followed by a sloppy patch job (if I remember correctly). once found, it was patched in space and apparently had no additional leaking.
I wonder if coating the entire outside of the module with the equivalent of soapy water. would reveal bubbles, like when a mechanic checks for a leak in a car tire. (yeah US'ian spelling)
Other possibilities, turn off the fans, seal the room, use a small smoke source at various points, and then watch where it leads. An extinguished match would probably be enough. What, nobody's got a light on the ISS? [such simple things on earth]