Sprinkler leaks usually take place as soggy spots, low pressure, or bubbling at heads

https://damientetu384.swiftnestly.com/posts/troubleshooting-low-stress-and-uneven-protection-in-sprinkler-systems

Sprinkler leaks probably look as soggy spots, low stress, or effervescent at heads. Inspect risers, lateral traces, and valves, then restore cracked fittings to restore technique efficiency.