IBM Power System Series Manual page 204

Figure 173: LEDs for a memory riser
If the locator function does not work, you will need to use the event log information to locate the
memory riser to remove.
11. To remove the memory riser that was identified, complete the following steps:
a) Open the release latches (A) on the memory riser as shown in the following figure.
Open the latches to the fully upright 90 degree position.
b) Pull out the memory riser from the slot by holding onto the latches.
200 Power Systems: Temple's Zeppelin procedures for install, remove, replace