IBM System x3530 M4 Installation And Service Manual page 14

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 12
CAUTION:
The following label indicates a hot surface nearby.
Statement 26
CAUTION:
Do not place any object on top of rack-mounted devices.
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System x3530 M4 Type 7160: Installation and Service Guide