Rear linkage / swingarm maint., & Abba Skylift clearance issue?

At 21k, you're probably in decent shape.......

Alternate plan...... this will allow you to inspect/lube all but the front relay arm bearing, which is high and not subject to very much "weather". Ditch the Abba, put bike on centerstand. Piece of wood under the rear tire to pry up and down on..... remove lower shock mount bolt, remove rear dogbone bolt. Pivot relay arm down/forward, now you can use tools on the middle bearing where the other end of the dogbones are. Remove all bushings, check bushings for corrosion and pitting, if OK re-use, if bad, check the bearing also for rust..... note, there is a fragile brown plastic retainer holding the needles equally spaced, do not damage it by too vigorous cleaning..... hopefully no issue. If no issue, grease the bearings and spread grease with a thin popsicle stick.... OK to have some excess, when you reinsert the bushing, excess grease will be pushed out. The idea is you have enough grease in there to prevent further water intrusion.

If bushings terribly pitted and rusty, likely the bearing is too...... probably should be replaced..... centerstand removal then required and replace bearings in a bench vice.....