IBM EXP15 Hardware Maintenance Manual page 26

5. Pull open lever and remove power supply.
Note
When installing a new power supply, make sure that
the latch is mounted to the side of the supply that is
toward the middle of the machine. If not, remove the
lever screw, flip the lever over and replace the screw.
See the illustration above.
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IBM Netfinity EXP15, EXP200, EXP500 HMM