Zodiak Curved Sheer Descent Leaking

[MermaidOne]

We have a 4 year old in-ground pool and have had leaks in the sheer wall since day one. The sheer is a Zodiac and its about 49"-50" long on the straight back-facing part of the sheer. My spouse said that the sheers were all square and this one shown in the pictures was cut on site to fit the arc in the sheer wall.

I have pulled off all the capstones on this wall to get to the source of the leaks and repair other issues with the wall. I want to repair this correctly.

1. If I must buy a new sheer, what type of saw and blade do you recomended for this job?
2. Is it possible to repair the seal in this with some heavy duty silcone product?

I would like to have a permanent solution. I have enclosed multiple pictures because sometimes it is hard to know what someone is referencing amd what is needed without good visuals.

Thanks in advance for good suggestions/solutions.

 

[ajw22]

Can you highlight where exactly the leaks are?

I would use Plast-aid and not silicone if the leaks are in PVC or plastic.

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