I'm going through my place looking to replace some loose or non working outlets. First two got fixed fine and I go to fix a third and I'm lost... The old outlet has 3 hot wires and 3 neutral wires going into it and no ground wire. I don't see a ground wire in the box and the ground screw isn't connected to anything on the old outlet. When I use a receptacle tester it shows that it is correctly wired (doesn't say open ground). I already looked around and figured out to use a pigtail to connect the wires (cause the new outlet only has two receptacles for hot and two for neutral) but now I don't know what to do about the missing ground? The old outlet is three prong with a ground screw and all the other outlets I've looked at in my place have a ground wire. Any suggestions? Thank you!