Yes, class B units in the ACT: Repair and maintenance of the whole unit, roof, gutters etc, is a unit owner’s responsibility. I don’t think this is an insurance claim unless it was somehow extraordinary storm damage and the gutters being less than pristine was only incidental.
In the ACT Class B = townhouses (generally). Class A = flats (generally). It is about whether the strata run vertically or horizontally.
If the buildings are of a certain age, those fibro sheets under the eaves are almost certain be asbestos and require specialist removal.