Plumbers came out (late) on his birthday and after two holes still couldn't find the leak. They came back on Tuesday and after two more holes found that we had a crack in the cast iron drain pipe that our master tub emptied into (i.e. it was nothing that we caused or could have prevented), it was the last thing we had suspected. We are still hassling with HOA insurance and our personal homeowners insurance. I hate insurance companies!!
Three of the four holes