Don't count that it was someone from maintenance. It might have been someone who was sick and tired of listening to that creaking.
Years ago, when I worked in a nursing home in Ft. Lauderdale, the door that separated the residents dining room from the employee lunch room creaked like that.
After asking maintenance multiple times (and filling out their forms....jesus, a form for a squeaking door) I just brought a can of WD40 from home and fixed it.
The maint guys got mad at me for doing it, asking me why I didn't tell them.
They hated me. I was always pointing out bothersome things like leaking faucets in residents rooms, and bringing them tv remotes that needed new batteries, or programing. It really put a cramp in their style apparently, to do things for the people who lived there.
Oh, and then there was the time there was a fire drill. When we had one, after securing the residents, we were all supposed to meet in the first floor lobby. When I arrived they told me I broke the rules because I came down the stairs from the 2nd floor. I pointed out that there were signs that said "Do not use elevators in case of fire." They said there wasn't a fire, it was a drill. I said I couldn't know that. What if a fire had occured right at that time? I said I wasn't going to get trapped in an elevator if there was a fire.
And then there was the time.....