Spalling causes damage to wooden flooring with under heating – who pays?

A Neighbour has wooden flooring throughout unit with under heating system. We recently received a building report and there are several sections of the building that requires remedial works. The Neighbour states he has complained about this over several years but has been reluctant to work with the OC & strata manager due to his type of flooring?

The Neighbour has two sections of his wooden flooring that has rotted due to spalling and is claiming that the owners corporation must pay to replace his flooring post spalling remedial works? Other neighbours who have experienced similar spalling breaches have had the spalling dealt with through the strata manager and have replaced their flooring type either through insurance or personally.

Can you provide insight as to the above and where in the Strata Act there are rulings as to the defined OC & lot responsibility? 

Thank you

Floyd0