Awesome! Now that they are uncovered, the 4 outer ones look like the Hunter PGV’s, which is what I have, and are super easy to swap the guts out…glad it worked out for you!
As for the one not hooked up. Looks like there is a good chance that was a grass zone since I don’t see a pressure reducing device on it. Was that your only grass zone? The others all look to be drip zones?