Whale said
4) This is why your Owners Corporation should have Registered a Special By-Law with conditions or issued a written prior consent with conditions to each Owner who wanted to enclose their carports, because in the absence of conditions such as one about the Owners being responsible for on-going maintenance and repairs of the additions (i.e. the doors) then the Owners Corporation becomes responsible for that maintenance as the additions are by default deemed to be Common Property.
I agree with everything you have said except this bit. The OC is ONLY responsible for returning the property to it’s original state (without any doors, just a carport) otherwise every man and his dog would be making alterations and additions to their property without permission on the understanding that it becomes common property and OC responsibility to maintain.
I cannot quote a source for this just my understanding of previous post here and elsewhere. If I’m wrong please let me know.