IBM DS5100 Installation, User's, And Maintenance Manual page 10

Statement 8:
CAUTION:
Never remove the cover on a power supply or any part that has the following
label attached.
Hazardous voltage, current, and energy levels are present inside any
component that has this label attached. There are no serviceable parts inside
these components. If you suspect a problem with one of these parts, contact
a service technician.
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IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User's, and Maintenance Guide