A very legitimate question since it is so hard to visualize under the transducer while the machine is in action. I plan on spending a lot more time today trying to precisely see and photo/video the leak before I do anything more aggressive and run the risk of damaging other structures.
One question I have, though, is the T which the transducer attaches supposed to be easily moved? The T rotates pretty easily with any pressure. I dont see that the leak is coming from where the T attaches to the return line, but it's still weird to have it mobile.