Jimmy T
I actually don't agree with this unless the Owners Corporation were negligent, knew about the leak and did not move to fix. Accidents happen all the time and the leak as described was an accident.
Forexample if this owner had a very expensive painting worth hundreds of thousands damaged by this leak the owners be responsible for its replacement.
I agree however if the lot owner advised the owners that there was a leak and the owners did nothing to repair the leak then that would be an entirely different story. In this situation the Owners would be liable and that is why any notification to the owners of a problem with common property must be acted on without delay.
The owner should ensure thier contents, which includes paint and carpets (and paintings). Contents insurance would pay for the repainting of the room which probably means the entire room.
In a nutshell you cannot hold the owners financially responsible for replacement of these items when the cause of the damage was not due to any negligence. That's why we have insurance to cover accidents.