IBM System x3755 Types 7163 Installation Manual page 12

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.
Statement 26:
CAUTION:
Do not place any object on top of rack-mounted devices.
Statement 27:
CAUTION:
Hazardous moving parts are nearby.
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IBM System x3755 Types 8877 and 7163: Installation Guide