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Easier to replace, but if you’ve got the time and interest you might wanna give it a shot at servicing.
http://www.bikepro.com/products/bottom_brackets/shimda.shtml
According to that article, they were able to remove the side covers on the bearing cartridges, exposing the bearings. If you can do this, then you can service the cartridge like you would a Chris King hub. You might find once you’ve cleaned the gunk out that the bearings/races aren’t worth servicing though.
Adhiero
HoKe
My DA 7410 Cartridge BB is feeling quite rough, anyone know if this can be serviced or will it be easier to just get a replacement?