OverIt – We’re not privy to all the issues, although I suspect there are some additional and perhaps long-standing ones between you and your Committee, on the basis of this and your other posts it’s clear that your Unit has a range of mould-related problems albethey apparently due to different causes, and further that you’re prone to initiating your own paid investigations instead of affording your O/C the first opportunity to maintain its Common Property.
I’ve previously explained the down-sides of your approach, and even though you regard that as necessary (?) and it’s been in circumstances where you have a tenant that understandably you wish to retain, and on the basis of your Property Manager’s advice (who should know better), it has the potential to muddy the waters of responsibility and raise issues with payment; and it has!
What does that tell you?
Anyway, from what you’ve advised here, in general terms provided the ventilation system is communal and it’s not blocked due to misuse, it’s the Owners Corporation’s problem and it should at least properly investigate to definitively identify the cause of the problem that you’ve reported,and how to rectify that.
So as you’ve indicated on your other post, add the ventilation problem to the list of those that you wish to submit to Mediation, and perhaps in future discuss any maintenance and repair matters within your Unit with your Strata Manager (who works for you) in the first instance.