Only way to figure it out is to "drive" it on a rack and have someone listen to the front diff, wheel hubs etc with a stethoscope. You may have to disable traction control to prevent throttle or brake intervention with all 4 wheels in the air.
As the owner of a repair shop as my regular primary gig I completely agree. Or, If you want to get dirty and check it yourself...(not running of course) block the tires on a level spot so it won't roll and throw everything into neutral with the parking brake off and crawl under there and rotate things around to see if you hear a "click" in a CV joint.
