Lenovo ThinkStation E30 - Manual (Page 36)

You can find the replacement instructions for the following CRUs in the
ThinkStation User Guide.
The following table lists the CRU information for the following machine types:
7782, 7783, 7821, 7823, and 7824.
Self-service CRUs Optional-service CRUs
Card reader (available in some models) Front fan assembly
Hard disk drive Heat sink and fan assembly
Keyboard Power supply assembly
Memory module Rear fan assembly
Mouse
Optical drive
Peripheral Component Interconnect
(PCI) card
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ThinkStation Safety and Warranty Guide