Opened my pool on Monday. While SLAMming, noticing lots of bubbles coming from return jets. I've narrowed the leak to somewhere on the skimmer side of the 3 way diverter valve(no bubbles when using only port 2). My suspicion is the union is leaking because it is on that side of the valve. Otherwise, I'm thinking cracked line somewhere on the skimmer side. Is replacing that valve my first step?