Leaking Return + other additional leak (updated)

[Fbskiracer]

Update at the top:

So I had my pool returns replaced after they failed a pressure test and the leak is slower, but still happening. I do have a small bubble in the pump I didn't have the last two years, so now we are trying to isolate the skimmer vs the main drain.

My new questions and this was insinuated by the repair team the pool company that installed and closed the pool may have liability here, but do I have a chance in heck in pursuing them and if so how?

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Original -
My pool was opened in 2020. It has been closed by the installer every year and I am less than thrilled overall with their service as a whole. I apparently have a leaking return. The returns are plumbed together so they couldn't isolate it the leak during the pressure test.

My calculation is that I'm losing around just shy of 100 gallons of water a day. I'm putting 500-750 gallons in per week. One is under a patio (with a massive french drain nearby) and one is in the yard. The lawn doesn't seem to be dieing from the chlorine/chemicals. I had borates in the pool last year too but the level tanked from what I expected when I opened so who knows when it started leaking.

Is there any point in a moisture meter/sensor to try to check by the walls or is it just a pure guess?

Any advice for trouble shooting this before having someone guess which line to try to dig up?

 

[rstarke]

Could you post pictures of the equipment pad and the returns/return lines?

 

[Texas Splash]

I had a tricky return jet break. You can see my experience below.

Leak Detection (Pressure Side), Results, and Frankenplug

After 9 years it finally happened – the dreaded leak. Here is my story. In the San Antonio area we have black clay soil that is horrible for structural support of any kind and often causes problems for home foundations, fencing, asphalt, pools, etc. When we observed excessive water loss, I...

www.troublefreepool.com

 

[Fbskiracer]

updated the original post:
So I had my pool returns replaced after they failed a pressure test and the leak is slower, but still happening. I do have a small bubble in the pump I didn't have the last two years, so now we are trying to isolate the skimmer vs the main drain.

My new questions and this was insinuated by the repair team the pool company that installed and closed the pool may have liability here, but do I have a chance in heck in pursuing them and if so how?

My calculated leak rate right now 140-165 gallons per day. (Calculated by measuring water drops inside the skimmer and by adding water w/ Flume electronic meter)

Today I shut down the pool (pump off, skimmer and returns plugged) just to see what happens over the next 24 hours. I also closed the skimmer valve on the pad.