I have three zones for the front of my house.
Zone 1 is working fine and has 8 heads.
Zone 2 is fine and has three heads.
Zone 3 is struggling. It has 12 heads (although I’ve capped three). The zone runs under my driveway. I have some pressure to the remaining 9 heads but the pressure isn’t strong enough to push any of the heads up. This zone worked 2 years ago. Is there any other possibility than a significant leak?