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farewell
If the bearings are notchy, fresh grease won't change that.
The bearings are sealed.
Remove the locknuts and unscrew the ends of the axle against each other (it's in two pieces). You can then remove the axle and bosh the bearings out. Check what's written on the bearings and order replacements from the likes of simplybearings.
If you get stuck I have replacement bearings (and a track axle for that matter).