IBM 9080-M9S Manual page 436

Figure 370. Locations for the adapters and cassettes in the 9080-M9S system
The adapter has three LEDs that indicate the following status:
• A power/activity LED (green)
• An identify function LED (amber) for the adapter (labeled C1)
• An identify function LED (amber) for the cassette (labeled with an exclamation mark)
430 Power Systems: Removing and replacing parts in the 9080-M9S system