Hi Cobra
I think we can safely say that the Owners Corporation (Body Corporate) has to pay for both the replacement of the tiles and for the paintwork. Even if the water leaks weren't their fault, they are their responsibility.
Your EC and/or strata manager may tell you the the paint on your walls is your responsibility – which is true … but not if someone else damages it. This is one of the most common misconceptions in the business so don't be surprised if they tell you you have to fix the paintwork yourself. But the fact remains, they are responsible for the problem so they are responsible for the damaged paintwork and they have to pay for the remedy.
On the question of the tiles, your issue will arise when it comes to replacing like for like – a little flexibility in this area will probably lead to a quicker satisfactory outcome for all concerned.