I'm the sysop at one of the other
wikis, and was wondering how
to de-sysop another user. I don't want to block the user, but he was made
sysop without any notice, and I think it was a mistake.
You can ask a steward to do this at
http://meta.wikimedia.org/wiki/Requests_for_permissions
If you can provide any evidence that it was only a mistake, or get
confirmation from the bureaucrat who assigned this user adminship,
that would be helpful.
Angela