Oh man, the memories. During my years working for a tree farmer, finding and fixing broken field tiles was a constant chore. Often, I was the one who’d find them. I’d see a sinkhole while out mowing. But sometimes, there’d just be a big wet area, which meant “fishing” with the backhoe.
Some of those tiles had been laid 100 years earlier, and we had to guess. Sometimes it was just patch, other times, we’d rip out entire sections of clay tile and lay all new pvc. Either way, I was the guy in the hole.
Good luck with your water bill!