In my experience, both doing leak detection, and in hiring it done, it's icky-picky time consuming work that often has a less than definite outcome when performed by someone skilled who's physically at your pool -- trying to do it remotely via a forum is unlikely to succeed.

We can help walk people through a bucket test, to see whether they really have a leak or not. And, we can tell them likely places to look for troublesome suction leaks. But more than that? Probably not.