Advice for rust spot on AGP

[Randall6]

I have a 2 year old 15x30 salt water AGP. I had a builder put it up, and they installed the skimmer and return fitting. I connected the rest of the plumbing, including the salt generator. I noticed a small trail of rusty color dripping from the return fitting on the outside of the pool. I was not able to get it removed last season, but this year, while closing, I became concerned about how it looks. I also noticed a very slow leak on the skimmer housing where two parts connect (about 4 inches back from the pool wall). So, I just removed them both, and have (hopefully) attached pictures below showing the issues. The return fitting is clearly the bigger concern, and I am trying to understand exactly what caused the leak, which led to the rust and what, if anything, can be done to limit any further progression of rust. There is a sacrificial anode installed in the plumbing lines, on the return side after the salt cell. Any input is definitely appreciated.

Randy

 

[kimkats]

It is rusting from the inside of the wall towards the outside. You will need to remove the liner to get to the wall to sand it and paint it. You 99% will not be able to reuse the liner I am afraid to tell you

The gaskets look like there were chewed up pretty good during the install so they did not form a good seal