IBM Power Systems RDX Manual page 64

Figure 43. Installing the service access cover
3. For a rack-mounted system, unlock the blue rail safety latches (A) as shown in Figure 44 on page 51
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.
50 Power Systems: RDX docking stations, power cable, and removable disk drives for the 9009-41A, 9009-42A,
or 9223-42H