Remember the building manager works for the OC so if he pays, it ends up that the OC pays.
I had a similar situation where on first inspection after the first AGM the fire assessor found a number of defects. Like yours they were there prior or handover.
We contacted the developer and pointed out that these were defects and he got onto the builder who fixed the defects to the fire certifies satisfaction.
I think in the current climate where the building commissioner is holding builders and developers more accountable, it would be hard for either to hide behind the private certifier. (Private certifiers these days have to do more than just accept compliance statements from the tradies. They need to do site inspections as well)