bearing in mind that the Owners Corp has responsibility for common property without limitiation, if they bacame aware that there was a potentially dangerous situation created by unauthorised changes to CP, they would be negligent not to do something about that.
And even if they weren’t aware, it could be argued that they had some responsibility but, really, it would fall back on the person who made the changes.
But I don’t think an Owners Corp could, for instance, lock a door because someone might bump their head walking through it. They could, however, deny access to a stairway built on common property if the stairs themselves were demonstrably unsafe.