IBM Power System 9009-41A Manual page 28

Figure 12. Removing the service access cover
9. Press and hold the push-button (A) on the trusted platform module card to activate the identify LED
for the faulty part as shown in the following figure.
Verify that the LED (B) is lit, which indicates that sufficient power exists for the identify LED. If the
LED (B) is not lit, use the location code to find the physical location by using the service label.
14 Power Systems: Power Systems: Control panel