It all depends if the windows were installed under the terms of a special by-law and what the terms of the bylaw were, concerning ongoing maintenance.
If there is no by-law on record, but the previous owner had written permission, it gets very murky. Chances are you have to fix them yourself but responsibility could default to the OC but that would mean they also “own” the windows and could decide to remove them.
If the previous owner didn’t have permission, the owners corp could ask you to either take responsibility for the maintenance (via a special resolution) or remove the windows entirely, so you might not want to push the maintenance issue.