Help please. The flat upstairs installed a boiler and a copper drain. Now we hear water dripping in at least three places - near her boiler and near her radiator in the living room and her radiator in the bedroon. We complained that water is dripping and we hear this sound all night. I am recording it now with intervals of 2 to 4 minutes. What is the best way to investigate? I was told this is a nuisance, furthermore, my ceilings have started to stain in all three areas. Is this a plumbing issue, a radiator issue, a boiler issue, or all of the above?