Is their some kind of device that can take a picture to locate where these leaks are located?
An infrared camera might be your best bet. They're quite expensive, but you might be able to find a place locally to rent one. You might also be able to find a local plumber or HVAC company that has one, and would be willing to come out and take a look for you. It might be worth it to pay a bit extra, to have somebody who knows how to use the equipment help you.