Yama X-MAX 250 (2007) loud rear axle drive – bearing?

Hello together, is there experience with the rear axle drive of the X-Max 250? I’ve been proud owner of this scooter for 2 days. He also drives wonderfully, alone the rolling noise of the rear wheel I feel very loud. It sounds like one or more bearings are defective. Hinterachs transmission oil is inside and looks quite fresh. Running power 38,000 km. Question: are there experience values, which bearings usually break after this mileage? Can I assume that that it is only the bearings of the rear wheel or also the gearbox output bearing? Can I check this with simple means and without removal? Thanks already and greetings, Thomas