Leakage from external drain pipe causing problem in lower flat
I'm staying on 4th floor of a society, few days back 2nd floor flat owner came up with a complain that the drain pipe coming out of my washroom has leakage which falls in his terrace area. He asked me to repair that problem. I checked the situation and found that from outside drain pipe has leakage and I have no role to play in it. It's seems construction fault from builder side.
Please confirm who should be bearing repairing cost?
Related to housing society bye-laws