Hello Good morning, they came from the subway gas changing all the pipes of the street and they changed the meter and disconnected the gas pipe but they did the test and gave a minimum loss. They left a piece of broken pipe that goes to the main pipe of the house but since it is very large the house can be anything. My query is the following as I should proceed to see where the loss is since they are several meters and although the house is 15 years old, very good materials were put in that moment. I would like to know where to start to discard since a new gas installation went through me very expensive and only for a small section, if I had to do the whole house it would be convenient to pass everything to electricity. I also found the plans of the house where they fix the gas keys and pipes. Can a registered gas carrier cancel a part of the pipe so that it does not continue to the rest of the house and thus eliminate possible losses? since stoves and gas grill are no longer used. Thanks a lot!!