Just stripped the swingarm, linkages and shock out, with the intent of greasing up the linkage bearings and replacing the shock.
I loosened all the linkage bolts before removing the swingarm and was surprised to find one of the bolts was incredibly tight, i couldn't budge it, so I figured I'll have a go at it when the swingarm is out...
Turns out the bolt has sheared off in the gap between the swingarm lug and the linkage




It must have been like this while I was riding, as the bolt is seized both ends I haven't managed to turn it to shear it myself!
So now I'm stuck with a seized bolt both ends, which has miraculously sheared in the middle.
So, I reckon the linkage bearing has dried out and seized onto the bolt, when the linkage rotated it has sheared the bolt in situ.
I'm at a loss, I can't remove either end of the bolt

I have a spare swingarm but I would need to source a spare triangular linkage I suppose.