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Pretty rare to have to replace the bearings. The cages will notmally be somewhat loose of course, but if a cage would be so loose as to make you worry about the bearing coming uncaged in your hands, or if you see a lot of discoloration (blueing) of the individual rollers or they are pitted, then you should probably "issue a stop-work" and do the bearings. But again highly unusual and unlikely.
Also examine the races for any signs of scoring of course.
Gilly
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