Help finding and repairing a leak in the lines...

Had someone come out. They found the leak right away and then managed to take 5 more hours to dig a 3x3 hole around a flagged tent stake hole about 15 inches deep to fix it. They did a good job but I'm a little miffed about the labor time. Turns out it was actually the return line which completely baffles me. At least it's fixed...
 
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