Had a leak in our plumbing last year as well. Shallow end return, paid a company to pressure test it (just to be 100% sure where the leak was). They also gave me a quote to fix it....with me digging the trench they wanted 450.00 to run the new line and connect it to the existing return port.

Honestly, I dont see why American wont just cut the existing line off the existing return jet and then run another line to the same return jet, unless this return jet is really close to the bottom of the pool (but it doesnt make sense a return would be that low). In my case I took out a 1'x1' chunk of concrete directly above where the return is, dug down to the return, cut the existing line then ran a new line from the pump to the existing return jet. Used ultra-high-pressure flex line with a secondary barrier built into it to stop rocks from cutting the line. From now on Ill make sure its winterized correctly.

-Chris