IBM 9080-M9S Manual page 217

Figure 183. Removing memory modules
4. Hold the memory module by the edges and pull it out of the system.
5. If the removed part is used again, place the part on an electrostatic discharge (ESD) mat.
6. Install a memory module filler into the empty slot by pushing it into slot until the tabs (A) lock into
place as shown in the following figure.
Memory modules 211