i sort of saw this addressed elsewhere but it didn't help me. i can't get the elevator to move. it has a lever on the outside to "call it" but no way to move it.

i read that it needs a lever to repair it, and i was already up in Kezz's room, took the key and book, but can't seem to go any further. supposedly the way to fix it is behind a locked door? any help would be appreciated. thanks!