Came out for random reoccurring leak in ceiling in basement. Ran every fixture on every floor above the wet spot. Small wet spot slowly soaking down through insulation. Pulled saturated insulation out. Found an open 2” pvc pipe that used to be some sort of wet vent. Unsure where the termination point was above as the piping was inside the walls, however the opening was directly above the wet spot. Homeowner said they believe the leak would occur during heavy rainfall but were unsure as it would happen every time. Pipe appeared to have some minimal moisture still inside. Believe either condensation or rain was running down the pipe periodically and soaking the insulation in the ceiling before ultimately coming down through the drywall. No way to recreate this issue. Capped the pipe off. No sign of moisture anywhere else on the subfloor above other than old water spot from old shower leak before they had it redone. No further issue at this time.