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|Sun Fire X4640 Server Service Manual Sun Fire X4640 Server Documentation Library|
The replaceable components in your Sun Fire X4640 server are designated as either field-replaceable units (FRU) or customer-replaceable units (CRU). A part designated as a FRU must be replaced by a Sun-qualified service technician. A part designated as a CRU can be replaced by a person who is not a Sun-qualified service technician.