Our apartment is 4 year old and we are staying in the 4th floor. There is water leakage from our bathroom to the celing of the bathroom of the 3rd floor flat(Down stair flat).We also found water leakage(water dripping) just outside of our apartment wall between the two flats bathroom ceiling.We repaird it by checking outlet water pipes.but still problem exists.I request you to kindly tell me possible solution.