Alienware Area-51 R3 Threadripper Edition Service Manual page 154

3 Remove the rear I/O accessibility lighting cable through the slot on the
chassis.
Figure 67. Removing the rear I/O accessibility lighting cable
1 chassis
3 rear I/O accessibility lighting
cable
4 Remove the four screws (#6-32x6) that secure the power-supply unit to the
back of the chassis.
5 Lift the power-supply unit cover away from the chassis.
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2 securing clip
4 slot