Lenovo ThinkPad Edge E420 Hardware Maintenance Manual page 36

select SERVICE PARTS. Under "Parts Information by Date" select SYSTEM SERVICE PARTS. The list of
service parts by description, with applicable machine type model and FRU will be displayed.
Using the HMM
For Key Commodities (Examples - hard disk drive, system board, microprocessor, LCD, and memory)
Use the HMM as a back-up to PEW and eSupport to view the complete list of FRUs at the MT Model level.
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Hardware Maintenance Manual