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It is necessary to install the lower end of the drain trap in the kitchen, because the washing machine is a power drain, so it is necessary to install a British green future suction valve to supplement the drain with air so that the water seal in the drain will not be damaged, and in addition, it is necessary to check the drain pipe frequently for problems such as grease blockage.
It should not be corrosion, it should be aging, I judge that the quality of the plastic drainage pipe is too poor, it is recommended to replace a good quality try, I hope it can be solved.
If the pipeline is encapsulated, find the exact location, open the encapsulation (there is a marble machine, angle grinder to install a suitable saw blade to cut), PVC material can be replaced with a section, metal pipe can also be replaced, the main pipeline belongs to the public facilities can be repaired by the property department to belong, the owner can cooperate with it
The property is responsible for repairs, but will not be compensated.
If it is not stipulated in the contract, it is the owner who finds someone to fix it himself.
No problem, it won't seep downstairs.