I recently noticed that a three-prong outlet stopped working. Short version: I checked the wiring and there are only two wires running to the outlet and no visible ground wire. I checked another outlet in the room and it's setup the same. So I'm guessing these are both incorrectly setup?
Longer version is that I tested with a working light plus an outlet tester and tested resetting the breakers. The outlet tester has previously shown these outlets as "correct" as grounded outlets. Is this because the box is grounded? I want to get the outlet fixed, but not sure if I should try replacing the fixture or get someone in to fix the wiring?