Question about the Genius Bar and Macbook security [View all]

I've never taken it in for any service, but know about the nightmare of waiting for service there, even with an appointment. What I need to know is, do the assistants need ones password to replace a battery? What about note widgets and things like that? I keep some passwords on my note widgets that I don't want anyone to see, but don't want to put in my keychain.

Anyone have an answer? Thanks!