Last year we had a water leak in the drain pipe of our 2nd floor toilet. It dripped onto the 1st floor kitchen ceiling and created a soft, discolored spot over time. That's how we discovered it. We've had the ceiling cut open and the pipes repaired.
Soon, we are remodeling our kitchen. We're installing new cabinets that will have crown molding to the ceiling. (The old cabinets did not go that high.) The place where the ceiling was wet from the leak is directly above where the new cabinets are being installed, so it would be hidden if another leak ever happened. That is, until/unless it got so bad that it leaked through the ceiling and destroyed the new cabinetry.
Since we won't be able to see it, is there anything we can do before everything is patched/installed to detect future leaks?