Hi. I recently purchased a home and have been living here for almost a month. yesterday I noticed a my basement wall was a little damp about 6 inches below where the sewer stack exits the house. I ran some water down the drain for a little while and noticed some water seeping through the basement wall and trickling down the wall The sewer stack going into the wall is galvanized. I do not see any cracks in the block wall in this area and after a while the seeping stops and the wall dries. Could this be a major project to repair or might I be worrying about nothing?