1) Get your strata committee to organise a strata committee meeting asap.
2) List the history of the leak in the agenda of a meeting.
3) Publish the minutes of the meeting ASAP.
4) Add a copy of the documents to the strata record which any owner will come across when doing a strata search.
5) Assuming you have contents insurance, call your insurer and ask for guidance. Maybe they will repair
your damage and they will go after the unit that caused the leak. If so, that’ll be a great solution.
6) Your idea of advising the agent is not, I feel, the best way to handle this. Agents will often follow the paperwork, ie minutes of meetings; letters of demand etc. Not so much comments from a neighbour.
Just my 2c