I am assuming there is no exclusive use by-law in place or anything else covering those works? If there is the answer, would be different.
You didn’t carry out any works to the common property, i.e. they were done by a previous. In the absence of a by-law making the owner of the lot responsible for the works, you aren’t responsible for them, the owners corporation is, insofar as they are common property. So if they are concerned about them they have to fix them.