IBM X3950 X5 Problem Determination And Service Manual page 14

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 11
CAUTION:
The following label indicates sharp edges, corners, or joints nearby.
Statement 12
CAUTION:
The following label indicates a hot surface nearby.
Statement 13
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IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide