IBM Power Systems 9009-41A Manual page 23

Figure 6. Releasing the side latches
16. Remove the service access cover.
For a rack-mounted system, complete the following steps. Refer to Figure 7 on page 10.
Attention: Operating the system without the service access cover on for more than 10
minutes when the system power is turned on might damage the system components.
a. Release the service cover latch by pushing the release latch (A) in the direction shown.
b. Slide the cover (B) off the system unit. When the front of the service access cover clears the upper
frame ledge, lift the cover up and off the system unit.
Removing and replacing the system backplane in the 9009-41A, 9009-42A, or 9223-42H 9