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"I would begin by pulling the lavatory bowl cabinet away from the wall and opening the wall behind the cabinet. It would be easy to patch that hole and it wont require a finish as it is concealed behind the cabinet. If necessary, you could make another access hole in the floof under that cabinet, which again would be concealed by the cabinet.
Once you have a hole, get a small mirror ( i carry a ladies makeup mirror with a plastic frame about 2 x 5 inches). Hold the mirror inside the wall or floor cavity and shine a flashligth directly onto the mirror, it will reflect the light into the hole on your line of sight and you can see the results in the mirror."
This 'lavatory bowl cabinet' you mean the cabinet holding the sink, right? How big is the hole normally it would have? If I do it bymyself, how long would be take?
Will the water inside the wall and ceiling be getten dried after the leak get stopped?
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