I am a new pool owner and our PB identified a leak in one of our bubblers while on. Now to find where it is leaking specifically. My PB did this by way of a pressure test but until this recent test there were no ‘plugs’ on the lines at the equipment pad, while my returns had them already. I now question if pressure testing on the bubbler lines and separately my spa lines ever happened during build since they don’t contain the plugs like my returns do. During build, are there various ways to pressure test lines or do the plugs indicate the testing most likely happened?