It was my idea to repipe as there is problem with my internal pipings, it is giving way one by one. Most of the other residents in my Taman also face the same issue. Hmm..maybe it is a good idea to ask him to check if the rubber seal worn out at the stop cock. Anyway since the pipes have been bypassed, there shouldn't be any water running through the said pipe right? My friend has asked me to monitor for another day or two to see if it is the remaining water in the pipes. Thanks.