IBM 7378 Problem Determination And Service Manual page 273

12. If you are removing another SAS backplane, repeat steps 10 on page 254 and
11 on page 254 to remove the remaining backplane.
13. If you are instructed to return the 2.5-inch hard disk drive backplane, follow all
packaging instructions, and use any packaging materials for shipping that are
supplied to you.
Chapter 5. Removing and replacing server components
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