2.4.4 Field-Replaceable Units (FRUs)
Many of the library's major components are available separately as Field-Replaceable
Units (FRUs). These components can be removed and replaced in the field by qualified
personnel. See Chapter 7 for a complete list of FRUs, their part numbers and re-
moval/replacement instructions.
Some FRUs can be added to a unit as an expansion item. The instructions for install-
ing an expansion FRU for the first time, or for permanently removing an expansion
FRU are contained in Chapter 8.
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