Mine started creaking at Newcastle last year while waiting at the ferry, had the torque re-checked at Koblenz by Motorrad on the way south, everything was fine but then slacked and re-tightened again away, creak went away for a while but came back next day.
Rode down into Albania and Macedonia carrying a spare set bought in Koblenz and then all the way home...fuel pump failed in Albania but that's another story, other than that they got us all the way round and they fell apart when I took them out. Helensburgh to Aberdeen would have been no problem
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They were new bearings fitted the previous winter and properly greased and adjusted ( best to ignore the torque setting ) so maybe just a bad one on the fixed pin side.
Don't try to pack grease into the M/works set using a grease gun as your likely to blow the back off the bushing !