IBM eServer 380 xSeries User Reference Manual page 61

Complete the following steps to replace a hot-plug PCI adapter:
1. Review the information in "Before you begin" on page 32.
Statement 15
CAUTION:
Make sure that the rack is secured properly to avoid tipping when the server
unit is extended.
Statement 16
CAUTION:
Some accessory or option board outputs exceed Class 2 or limited power
source limits and must be installed with appropriate interconnecting
cabling in accordance with the national electric code.
2. Slide the server out of the rack.
3. Loosen the thumbscrews on the rear cover, and open the cover.
Thumb screws
Rear cover
Chapter 5. Installing options
47