It may well be that the dealer doesn't want to pursue it, as he will get a lower labour rate for warranty work than "paid for" work, particularly if you gave off a vibe that you would probably do the job yourself anyway & sod the warranty.
IMO it would be in the dealers interest(from a future sales POV) to offer to change out the bearings FOC to you even if MotoGB would subsequently "decline" the warranty claim. Cost to him in standard parts & an hour of "the apprentice's" time is negligable, but the goodwill engenderd would be large. You would maybe more likely to buy from him again & would doubtless tell others of this positive response. Would you do either as things stand ?
My dealer is exemplary in "going the extra mile" for customers - and has been for the 23 years that Mrs B & I have been a customers - but I appreciate that this probably isn't the norm for many. Early on I noticed a "special" screw missing from the Interceptor chain guard - when I mentioned this to the dealer, he took one off a showroom bike & gave it to me, mentioning that the one on the showroom bike was not full tightened & they would check them all from then on. Just normal service as far as he was concerned, but appreciated by me.