[posted simultaneously with Matt]
If the Dorade is like the one on the E381, the problem is that the roof inside was not properly sealed in the manufacture. The surface looks like wood. It rots. The weep holes easily clog, trapping water inside.
The solution, at least for me, is to provide an epoxy coating on the floor of the Dorade. If rotten, first prepare with Git-rot or similar. Then paint, for UV protection and appearance.
The weep holes have to work. The angle makes them hard to drill out, so before sealing the interior some protective tube or other anticipation might be useful.
In fact, my Dorade has not leaked. I have just filled and sanded the "wood" floor in the storage hole, painted it, and cleared the weep holes.
If the leak is coming from under the Dorade cowls, I'm sure the sealing project is considerably more awkward, since you have to work through the small openings.
Twin Dorades put a large volume of air below in heavy sea conditions when the rest of the boat is sealed, so if you can save them it's worth it.