My wifes 2010 XC60 T6 AWD has a low whining sound like a bearing going out that gets louder on deceleration. The car has 62K miles on it. It seems to come form the rear of the car but I can't pinpoint where. Could this be a bevel gear problem or has anyone had wheel bearings begin to fail with this sort of mileage? I don't know much about the bevel gear and testing procedure and I don't see fluid loss around the bevel gear. I am concerned that this could be a major issue. Any advice on how to inspect the bevel gear and check or change the fluid? Thanks.