I've since removed the linkage and swingarm. The damage to the swingarm from the chain is worse than expected. It essentially wore through and has damaged the bearing. I will be getting the grove TIG welded back to full wall thickness, my only concern is dealing with the weld that will inevitably penetrate to the inside. Hopefully I can get away with filing and die grinding to clean up the inside of the bore without having to take it to a machine shop. The other 3 bearings and all the seals seem to be in good shape, I see no need to replace them all yet. After this seasons riding I will disassemble and check and decide then if I want to replace the whole works as it all comes apart in only a few minutes and is an excuse to clean and re-grease all the linkage and swingarm bearings.