See Remove a CMIOU.
An illuminated green Fault Remind Power LED indicates that there is power available to light the faulty DIMM LED. Any faulty DIMM is identified by an amber LED next to the DIMM slot until you release the button.
Read the DIMM name text printed on the board next to the slot with the illuminated DIMM Fault LED (for example, BOB01/CH1/DIMM). See Determine Which DIMM Is Faulty (Oracle ILOM), DIMM Names, and Identify Faulted Components.