A quick and easy way to check the accessory drive bearing is to push on the pulley with a piece of wood while the noise is happening and see if the noise changes. Be very careful around moving machinery.
Also: The alternator pulley and the accessory drive pulley may somehow not be in alignment. This would cause a lateral force on the alternator bearing and lead to premature failure. The way to check for pulley alignment is to put a straight edge, such as a wood dowel, in the groves of the two pulleys and see if they are lined up.
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