No worries, and thank you so much! I've unlocked most of the doors. The only key I don't have is for the door in the upper left of the second floor (the bedroom, which I assume gives access to the attic). I haven't fixed the lift yet and haven't found the codes to the two doors with electronic locks. I've found the zhogtk in the library, but I assume I'm not able to get rid of it yet.

It's probably something obvious enough that I just keep missing. Really appreciate any hints you have!