It’s hard in a small self-managed scheme but basically the owners corp should arrange for repairs to common property and then charge the owner who caused the problem.
The owner of the awning should also be given the choice of repositioning the awning, paying for the repairs and accepting responsibility for future maintenance (via a by-law) or be required to take it down.
Ask for this in writing and if nothing is done within 2 months, seek orders under section 232 at NCAT.