My knee jerk answer is windshield. I have seen it more than a few times. A poor quality windshield replacement, the technician does not adequately prime the pinch weld and rust forms. The rust then separates the urethane from the pinchweld.
Its interesting their test showed no leak. I am willing to bet on my diagnosis.
Do you have a sunroof ?
Its interesting their test showed no leak. I am willing to bet on my diagnosis.
Do you have a sunroof ?