I was disappointed with complexity of the roller assembly and where it is located, under the rotor...All it takes to screw it up is a little dried saltwater and it will start acting up.... It being under the rotor, makes it easy for saltwater, dirt or any foreign matter to get in....There is a seal on the body, but I don't think it is much of a seal or the rotor could not rotate....
Anyway.... disassemble it, pay attention to the way the rollers and springs are assembled before you take it all apart (ask me why


I should have taken pictures, but I didn't...
Chalk's PMS (Preventive Maintenance Scheduling) for the month...

(I think the newer ones have incorporated a manual stop to back up the anti reverse and this might not apply)
A site for parts break out is here....Shimano Parts Break Out