Let me ask a related question:
when I give my mac to an authorized apple service center, am I obligated to provide them with my login password?
I think not. I think they have the tools to make any repairs or gain access anywhere they need on my system, without my password, but I just want to be sure.
Depends on the nature of the repair really. Apple themselves will ask for your user account password.
Are you obligated? I suspect no, but if they need it in assisting with the repair, just change it temporarily or make a new account and give them that one.