I just noticed that the clear-top Jandy "Check Valve" that's somewhere in the pipeline is leaking (water seeps through and drips).

I have some questions which I'd appreciate any pointer/help on:

1. Has anybody ever tried to "fix" such a leak? If so, is it just a matter of emptying up the line and opening up the screws and cleaning something in it? The valve itself doesn't have any crack and the water seems to be leaking from the junction between the clear top and the black body.

2. Is there anything I should know about to be careful while trying to unscrew the 8 screws on the top?

3. Do these things have any kind of warranty?

Here are 2 pictures of it: