IBM 6C4 - Manual (Page 68)

If either value is not valid, a failure message displays on the console. Press Enter
to return to the Power Control Network Utilities Menu.
v LED Indicator Menu
This menu displays the state of the processor subsystem disturbance/system
attention LED. Use this menu to toggle the attention/fault LEDs between identify
(blinking) and off. An example of this menu follows:
LED Indicator
1. CEC LED at location U0.1 Currently in IDENTIFY state
98. Return to Previous Menu
Enter LED index
0 >
The processor subsystem disturbance/system attention LED is on the operator panel.
50 pSeries 630 Model 6C4 and Model 6E4 User’s Guide