If someone is borged, it's temporary (at least until that person shows a history of disruptive behavior).

What does reputation have to do with it? I've been borged before. Does that matter? Nope. Did it affect my (personal) reputation? Nope. Did it affect the reputation of my nodes? Nope.

You could always /msg [Power Users] Who borged me? They don't have to respond but they might if you ask nicely.

If you feel the Power Users are abusing their powers, then it becomes an issue for the gods to deal with.

And how exactly am I to know which power user to complain about when I petition the gods? I cannot. Thus my petition is of no practical value. Anonymity undercuts reputation systems.

    -- Chip Salzenberg, Free-Floating Agent of Chaos

You don't need to know who did it. Remember, it's not your place to deal with the offender. Just give the gods all of the details. You could list the members of Power Users who were visible, the time it occurred, the length of time that you were borged and possibly a transcript of the conversation.

They should be able to check the logs to find out who is responsible so that it can be dealt with privately.