Leaks have to be repaired whether they're in plain view, under a foot of dirt, or under a foot of concrete. Happily in this case, it was only six inches.
There were hot and cold pipes that were leaking. We located the problem ourselves and did the concrete removal, excavation and repair.
Then we repoured the concrete ourselves. Others had to replace the tile work, but our capabilities shortened the amount of time that there was an open hole at the site.