We purchased a house last month and we have a problem with the sewer pipe. House was built in 1970. The basement was professionally finished a few years ago. The sewer pipe is in the basement, and the section that is leaking is easily accessible via one of the closets.
The leak is VERY small - so small I can't find exactly where the 'hole' (if it is an actual hole) is. Only reason I know there is a leak is because when we first moved in a month ago, I placed a piece of wooden furniture in the closet and yesterday, when I went to grab that furniture, I noticed a couple of drops of brown gunky liquid on top, right underneath where this section of pipe is.
So I looked closer at the pipe and noticed that the section towards the coupling is very dark. Is that normal? I'm prepared to call a plumber if I need to. I assume replacement of the pipe (it's about a 12 foot section, all easily accessible via 3 side-by-side closets). Here is a pic. Notice the darker area (I'm assuming that isn't normal and indicates moisture/seepage?) - the leak is coming from somewhere either in the dark section itself (is that moisture? It doesn't feel wet, for what that's worth), or in the connection from that section to the pipe to the left.