Hi all, thanks so much for your replies on this matter.
leechaorui and flashock, I've asked the condo mgmt about this and they said that they've never encountered an issue like this. They also do not have any plumbers to recommend to me. seems like they don't know what to do. I hope they're not hiding anything. flashock, I did bring this up to the previous owner, but being inexperienced, I never knew this was a water seepage issue.
Thanks hiong and godloveyou for the additional information. The link was very informative.
Thanks Chanel26 for the link to 24 hr plumbing. This will come in handy.
However, I'm still a little confused with respect to my particular case. The leaking pipe is not actually embedded in my kitchen's real ceiling. It is fully exposed. When I removed a panel of the false ceiling, I could see it. The pipe itself is made of PVC and roughly 10cm in diameter. It begins/protrudes from my real ceiling directly below the upper unit's kitchen sink, and runs along the length of my ceiling. I'm 90% sure it is the pipe for the upper unit's kitchen sink drainage system. Also, there are no wet/discoloured patches on my real ceiling and it is completely dry to the touch.
So for this case, who is responsible for the fixing the pipe? is it my neighbour since its part of his drainage system? or is it me since it is actually below my ceiling?
If anyone has any advise, pls share it with me as I'm completely new on this.
Thanks again in advance for the replies