The centre system had a leak.
and was empty after a few min.
They were ETOPS already and had the choice, or flying to Punta Cana or fly to Dub.
In Punta Cana is far and hard to reach by our mech. department.
So they decided to fly to Dub, also the crew heard some strange noice (hystr. oil coming out with 3000PSI to the weel well).
After a safe landing and out TD flown in to Dub the AC departed 10 hrs later back to AMS.
Cheers,
SLYLARK3