Lenovo ThinkStation D20 Safety And Warranty Manual page 44

You can find the CRU information in the ThinkStation Hardware Installation and
Replacement Guide for the following machine types: 4155, 4158, and 4218.
Self-service CRUs Optional-service CRUs
Diskette drive or card reader Battery
Hard disk drive Front panel connector assembly
Keyboard Hard disk drive fan assembly
Memory module Heat sink and fan assembly
Mouse Internal speaker
Power supply assembly
Optical drive
Rear system fan assembly
Peripheral Component Interconnect
(PCI) card
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ThinkStation Safety and Warranty Guide