consealed shower unit leaking from inside (video attached)

[alexanderv]

Hi.

New here.

Ripped the wall out to find the source of the leak and here we are. I notice theirs a screw on there but I'm not sure if this is a tightening screw. Other than that, what do i do to stop this leak?

Cheers

 

[king of pipes]

Video wont show ? 2468

 

[alexanderv]

Here is a clear video

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