Is the leakage of the sewer pipe in the bathroom in the building a property management or an industry supervisor?

Downstairs sewage branch pipe is a part of building sewage main pipe system. After the housing construction project has passed the warranty period (drainage project warranty period), the property owner shall be responsible for the maintenance. As for whether the maintenance cost is paid by the property company or the housing maintenance fund, it should be combined with the property service agreement signed with the property management unit.