IBM 88631SU - System x3850 - 8863 Service Manual page 16

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 10:
CAUTION:
Do not place any object on top of rack-mounted devices.
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IBM System x3850 Type 8863, 7362: Problem Determination and Service Guide