"What's that?!"
"That's the first computer from sage Hermione, it's been working and running continuously since our museum got it. Please fix it."
" ... ... have you had a look at ... 'it'?"
"That's why we called an expert. You can do it, right? We even got the original documentation!"
"I bet that documentation doesn't include ... what is this? Tell me, how often did someone else fix it?"
"About once every two years since it's been in our museum; we don't have any data from before."
"And do you have documentation of the fixes?"
"No, it was only ever minor things. But for an expert, that won't be a problem, right?"
Relevant link:
The Expert