pigtailed neutral & hot inside switched outlet box
im trying to figure out a way to split up my switched outlet. i opened it up and i have 4 wires in the box:
2 hot wires (seemingly coming from the same place) where one goes into the outlet and the other gets pigtailed with a neutral wire that is also coming into the box from a double set where one goes into the outlet and the other goes to this pigtail.
i have to say it is possible that the 2 neutrals that are coming in arent actually both neutrals because one looks different (visually) but they are coming from the same sleeve.
any tests i can do with a multimeter to figure out what is going on? and what would i do after breaking the bar on the outlet to create a split outlet? thanks!