I also have an Attalia '86. I love the boat! It sails very well and it is very roomy for its size. All my sailor friends were impressed.
A downside is that the bilge is very flat. Waters gets trapped in some places and I have to constantly lift the floor to soak it up. I'm also having a fresh water leak that I still have to solve.
I've also noticed that there are 2 bilge pumps in the head. One is for the bilge and the sump. There is a valve that swithces between the two. The other pump is a bit of a mystery. It is connected to the holding tank but it is not clear to me what it does. Does anyone else have a similar issue?
Another thing: I could not pump out my holding tank. The pump pressure is not strong enough to suck up the water. I would need a smaller hose to go all the way inside the holding tank to pump, but this is not a common feature in my marina. Has anyone had this problem?