Sprinkler leaks basically seem as soggy spots, low strain, or effervescent at heads

https://kyleriliv329.zenbloomer.com/posts/do-it-yourself-vs-expert-sprinkler-installation-what-you-need-to-think-about

Sprinkler leaks in most cases occur as soggy spots, low pressure, or effervescent at heads. Inspect risers, lateral traces, and valves, then restoration cracked fittings to repair manner performance.