[jklein11]

Can you explain what you mean by working for free?

It sounds like you got a new position at the same organization, but some of your duties were carried over. Were you specifically not paid for the sysadmin work you did after getting that new position? If not I would say that you were paid for that role. On your CV you can list those activities under your new role.

I would certainly never advertise that you did free work for a company(volunteer work is another story.) It makes the work you did seem like it was of low value.

You might get better feedback if you post a link to your resume. That way we could give more specific feedback, about your CV.