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My recent experience has been that a failed pulley or belt tensioner is usually the cause of shredded serpentine belt. It is a good part of the maintenance plan to inspect belt. I would not have thought about checking the pulleys until recent experience.
It might be a good idea to check starting at 90,000 miles as suggested above. Looking at them would show stress cracks in plastic. Removing the belt and spinning each pulley and belt tensioner by hand will give a feel for the bearings. The only way to know the condition of items that are known to fail is to check and test.
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