Sprinkler leaks in general seem to be as soggy spots, low strain, or bubbling at heads

https://edgarhzmz449.wpsuo.com/soil-slopes-and-sun-site-variables-that-shape-lawn-sprinkler-setup

Sprinkler leaks generally show up as soggy spots, low rigidity, or effervescent at heads. Inspect risers, lateral traces, and valves, then fix cracked fittings to fix equipment performance.