I'm not sure if Fulcrum wheels use the 4 bearing system that Campy uses on Campagnolo branded hubs and wheels. If so it's ultra easy to service the ratchet system. Yemove the axle from the left and the cassette body will come off together. In this system and others like them the ratchet is half on the cassette body, and half in the hub shell. That allows you to clean and inspect the ratchet ring, pawls and spring very easily and repair them (usually just the spring) as needed and reassemble.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.