I have a second floor washroom that started leaking into the downstairs kitchen. The leak is a drop-at a time, not constant water running.
I stopped using the washroom for a few days, and then tested by turning on the water on the bathtub. After the water was allowed to run for a few minutes, it started leaking again downstairs.
I cannot tell exactly where the leak is, it is either behind the wall or under the floor.
Please let me know what type of work would be involved, the cost, and the time required to fix.