I have an 18x40 inground vinyl pool with 2 of 3 return lines leaking. The leaks are bad - you can watch the water go down in the lines when filled by the pump and plugged in the pool. There are no visible signs of the leak - ground is dry and liner is in place around returns. Each return has its own line. The visible lines are PVC.
I was thinking of doing some digging to see if I can locate the problem areas and would appreciate any advice. I thought I would start by digging down by the pump and expect the 'elbow' where it turns to the pool. If nothing there I would try digging by the pool to inspect the joint at pool entry and any joints there. This one I am a little worried about - don't want to cause more damage. The pool deck is concrete that extends about 24" from the pool lip. Any issues with digging under the deck?