If there is play in the final drive pivot bearings, you would be best to remove them & check their condition.
You will need to heat the area of the swingarm where the pivot bolts thread in to soften the threadlock, and then swing on it with a long bar. Undo l/h adjuster first.
Refitting the bolts, remove all traces of threalock, install r/h bolt first, apply threadlock & tighten to 160nm, then l/h adjuster, apply threadlock & tighten to 7nm, then tighten lock nut to 160nm.
If the bearings show any signs of wear, replace them as they are not expensive. It is pretty common to have to replace them, so your local dealer should stock them, they aren't that expensive as a genuine part.
Hope this helps,
Brian.