Legal analysis: if it can be identified as a pipeline quality problem, you can sue the real estate developer; If it cannot be proved, all households who use the pipeline can be required to share the responsibility. If there is no evidence to prove that it is damaged upstairs, it will also bear the same responsibility. If the damage can be proved, let him bear it himself. The appraisal institution should be the quality inspection institute.

Legal basis: Article 281 of the Civil Law of People's Republic of China (PRC), the maintenance fund of the building and its ancillary facilities belongs to the owner. With the consent of the owner, it can be used for local maintenance, renewal and transformation of elevators, roofs, external walls and barrier-free facilities. The collection and use of maintenance funds for buildings and their ancillary facilities shall be announced regularly. In case of emergency, if the building and its ancillary facilities need to be repaired, the owners' assembly or the owners' committee may apply for the maintenance funds of the building and its ancillary facilities according to law.