The addressed storage device is the failing item.

1. Is the device location information available in the Service Action Log (SAL)?
   • No: Continue with the next step.
   • Yes: Exchange the failing item, refer to the service guide for the system unit for procedures to start disk service.
2. Find the IOP address and the device address (see System reference code (SRC) address formats, or see "System reference code (SRC) address formats" in the service guide for the system unit.
3. To determine the location of the I/O processor card, see Locating FRUs, or see "Locating FRUs" in the service guide for the system unit or the expansion unit to which the unit is attached, and find the diagram of the system unit or the expansion unit. Then, find:
   • The IOP card location identified by the direct select address.
   • The addressed storage device location identified by the device address.
4. Exchange the failing device. Use the device type to help determine the part number.

   Note the device type and refer to the Managing Devices document, order number SA76-0107 to determine the FRU part number to replace.