Start by trying to zero in on the leak better. Is it high or low? Where does the water leak down to? Which side is it on? The main manifold is downstream of the pumps, Is it a step equipment model? Follow the lines on that side. The upstream side is where the filter is. Could be there also. There may be secondary manifolds as well. They will be downstream also, possibly after the main or on a second pumps line. Each jet has a smaller line from the manifold/s. Once you zero in you will likely have to tip it on it's side if the leak is low.
How fast does it leak? Can you fill it and heat it to try and get it to leak a lot so you can zero in better.