IBM 9080-M9S Manual page 540

Figure 465. Activating the identify LED for a faulty part
9. Look for the flashing amber LED of the faulty or failed processor voltage regulator module. Processor
voltage regulator modules are in locations P1–C14, P1–C17, P1–C18, and P1–C21. Refer to the
following image.
534 Power Systems: Removing and replacing parts in the 9080-M9S system