My centaur has a number of leaks i have been trying to eliminate. Yes the bilges are all linked or mine are there is a small hole in the front corner nearest the engine, poor a cup of water in if they arnt blocked it will soon disappear . I,ve found the following so far.
Slow leak from the water pump on the engine.
The teak foot treads by the hatch are rivited through, they are well known for leaking, it drips on the engine..
The winches bolted through again another slow leak. Drips on the cushions.
The hatch depends on the direction of the rain and window seals. Also i had a number of holes from poorly fitted instruments, tiller pilot etc . Good luck i still haven't found all of them..