I recently played this same cat and mouse game with no success, so I built a better mouse trap using a disposable aluminum foil cooking pan and a Moen water leak sensor. I put the drip pan on a steep angle and bent/reshaped it to collect water at a single point where I placed the sensor. I wrapped the sensor in a small piece of paper towel so that even a single drop of water would be absorbed by the paper towel and trigger the sensor. I tested it with a single drop of water from a syringe, replaced the paper towel to reset the trap, and eventually I got a notification in real time on my phone as it dripped. Over kill? Yes. But it lead to me finally finding the issue.
