Before you take it to the dealer, pull the rear rotors. The ebrake shoes are a known failure point on Tutans. Not all fail, but enough of them delaminate to make it a good first check if you have single side noise. If it's not the ebrake, you can always take it to the dealer. If it's a bearing, I'd suggest that "should" be covered under powertrain, but the reality is, they're odd about what is and isn't covered. For instance, a Throttle Position Sensor isn't covered under powertrain, despite the engine being useless without it. Go figure.