Sprinkler leaks ordinarilly show up as soggy spots, low stress, or bubbling at heads

https://cesarotbm223.rivetgarden.com/posts/diy-vs-professional-lawn-sprinkler-setup-what-you-need-to-consider

Sprinkler leaks characteristically seem to be as soggy spots, low pressure, or bubbling at heads. Inspect risers, lateral traces, and valves, then restoration cracked fittings to repair system performance.