There hasn't been a non-sealed bearing on a performance car in decades, so re-packing a bearing is not the cure. Leave that to the old Jeeps.
Odds are you have a caliper slightly hanging up, or a pad/rotor issue.
Take the wheels off, remove the calipers and pads. Inspect and clean everything. Could be a glazed pad, a bad rotor, some brake dust buildup or other crud binding something up a little, or just brakes needing to be replaced. OEM pads aren't track pads.
I've never seen a wheel bearing 'squeak until warm'. Given the information provided, this is likely a brake issue.
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2012 Nismo | Gun Metallic | Stillen | Eibach | Kenwood | JL | Bridgestone
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