Back door and its screen door.

Each townhouse in our block has a door leading into the courtyard. Who is responsible for maintaining the deadlock on the door to the courtyard? Govt strata docs talk of “entrance door” locks as the OCs responsibility (original lock and its replacement) but no mention of other exterior door locks. I assume the front door is the entrance door.

As for screen doors on the courtyard doors – who’s responsibility are these? All units had an original screen door on these doors but many have been replaced by their owners. I can’t find any reference to these.

In particular, one owner or previous owner, has replaced a screen door with one not the same size as the original, and has thus had to cut a mortice to take the lock bolt which was far too thin (not enough timber left intact) and now wants to claim damage because, surprise surprise, it broke through the thin timber surrounding the mortice. So I’m trying to understand ownership and responsibility in these issues based on strata law or conventions.