It used to be that the owners corp had to fix and repaint any damage done while it was repairing a fault or flaw in common property, but they didn’t have to fix damage caused by the flaw. I know … I know … It is illogical and confusing and probably why it is no longer spelled out in the “Who’s responsible …?” document.
I think it will be covered by your building insurance and if the OC won’t claim, then go directly to the insurer.