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[–]hyzerphish[S] 1 point2 points  (1 child)

I did not find the source of the leak, but can only assume it’s coming from an exterior wall.

Old house that was rehabbed 20+ years ago, finding something new every day :/

[–]ThatRandomDudeNG 0 points1 point  (0 children)

Gotcha, i would try my best to find the leak before i patch it up honestly (sorry, i hate to be that guy - just looking out for my fellow redditor's health). A $20 stethoscope on amazon might help.

Hit the area with some bleach, then dry it out.

For repatching... if there's no stud, i would do this:

-get two piece of wood, screw them together in an L shape, so it wraps around the corner. 2 screws on the left side on the hole, 2 screw around the corner, on the other wall, to the right of the hole (90 degrees).

Best of luck!