Responded to a service call for a water leak the other night. When I arrived I saw that the kitchen wall of the town home was saturated. I cut a few small holes in the wall and used a camera to identify moisture. There was no moisture inside the wall, just on the base. After about an hour and a half of eliminating certain appliances, I thought it was the dishwasher but couldn't confirm that it was. I removed the dishwasher from the town home, pulled the refrigerator about 6' away from the wall, closed the ice-maker supply line off, helped the homeowner totally dry out the area and left. The following morning a water puddle appeared in the middle of the kitchen in about a 5' diameter with no indication of how it got there. They cleaned and dried the area. Around 3 pm water appeared in the area where the dishwasher was located. (The dishwasher was removed a day earlier) They cleaned and dried the area. I arrived the next day at 11am and it was dry. I one, by one flushed every w/c, turned on every fixture and filled to the FLR and drained. Nothing. The HVAC and the water heater TNP lines terminate on the opposite wall outside with on leaks. HVAC is gravity drained. After sitting there for about an hour contemplating what in the world it could be, right before my eyes, water (about a gallon) seeps out from under the cabinet where the DW was. It almost seems like it comes from under the linoleum flooring. But what would leak INTERMITTENTLY under a slab?
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Need the best diagnostic plumber on this one