Division of responsibility for leakage of toilet sewer pipe

According to Qijia's inquiry. Com, the responsibility for the leakage of the toilet sewer pipe is divided as follows:

The developer shall be responsible for the maintenance of public sewer pipes that leak and are within the warranty period; If the sewer pipe of the upstairs neighbor's house leaks, the upstairs neighbor will be responsible for the maintenance; If the neighbors upstairs refuse to maintain it, the property will mediate.