IBM 9009-41A Manual page 179

Figure 147. Installing the service access cover
3. For a rack-mounted system, unlock the blue rail safety latches (A) as shown in Figure 148 on page 166
by pushing them inward.
Ensure that the cable management arms can move freely. Ensure that the cables at the rear of the unit
do not catch or bind as you push the unit into the operating position.
Drive backplane cables in the 9009-41A, 9009-41G, 9009-42A, 9009-42G, or 9223-42H 165