rear wheel bearings need replaced on 2008 Toyota Sienna

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There is a loud noise coming from the rear of the car when over 15-20 mph. This was evaluated by Toyota, and they said the rear wheel bearing need to be replaced. The car has 55,000 miles on it. A review says rear wheel bearings in a front wheel drive car should last about 150,000. Has any one else had this problem? Other than replacing the brakes at a Monroe center which resulted in squeaky brakes due to not using toyota "shims", all work had been done at Toyota, and car has been reliable.
(2) Answers
at the mileage, there is no warranty. replace the bearing, as told, and move on. many factors can cause failures from curb hits to pot holes to brake dust.

I've got a 2008 with a broken right rear bearing, 33,000 miles. Took it in for the spare tire recall and happened to mention to the mechanic the loud humming noise that started a month ago. Mechanic says I've been real lucky I didn't have an accident, wouldn't let me drive it home, covered under warranty.