Its basically the common problem between top and bottom neighbors. My MBR toilet is experiencing leakage due to cracked floors from my top neighbor's MBR toilet floors.The water has already damaged the layer inbetween my unit and my neighbour. We have agreed to do repairs to solve the problem once and for all. HDB already quote us the price (shall not reveal here). However I believe I can get better quotes from direct sourcing. Basically: 1) repair the layer 2) tiling work for neighbor's toilet floor 3) repaint my MBR toilet ceiling