Wanted to head some good head scratching stories. What has really tapped your service and trouble shooting skills. My techs were working together on a commercial building that had many many problems. But the kicker was one weak zone. Couldn't find the leak/problem. They took the time to turn off and cap heads, which pushed more water to the leak. Water was flowing into a below ground electric box which looked very new. Probably over the winter. Also looks like new conduit from boring company along the street right near it. One pipe dove down about 2.5' and broken off, leading near the electric box and flooding into it. Water wasn't surfacing as it was filling the box instead.