IBM Power System Series Manual page 215

Figure 181: Removing the service access cover
9. Remove the memory riser from which you will remove memory modules.
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.
Memory modules and memory risers for the 9040-MR9 211