New Solar Air Leak?

I had a solar system installed on Tuesday and the installers told me I had an air leak which was causing the bubbles in the return jets. They pointed to a few leaks1) SWG unions, 2) pressure gauge on the filter 3) the drain valve. They said whoever is servicing your pools sucks , to which I responded I do...lol Anyhow I have done my own trouble shooting and think it is the solar causing the issue , but I could you some help confirming this before I call them to come back.

1) I lubed all my...

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