TWRBKPL

1. Are you working from the serviceable event view and a card location is listed with this failing item?
   • Yes: Then the listed card location is where the error is located. Continue with the next step.
   • No: Record the bus number value, BBBB, in word 7 of the reference code (see DSA translation). Search for the bus number in the management console's or operating system's resource and configuration interfaces or the system configuration listing to determine which unit contains the failing item. Continue with the next step.
2. The failing item is built into the I/O backplane of the I/O unit. Use the following table to determine the part number for the field replaceable unit (FRU).

   CCIN or FFC	Type and model	Part number	Description	Location code
   50A2	5802, 5877	See System parts.	I/O backplane	Un-P1
   50A2	5803, 5873	See System parts.	I/O backplane	Un-P1, Un-P2
   520C	5796, 7314-G30	See System parts.	I/O backplane	Un-P1

   If you need additional information for failing part numbers, location codes, or removal and replacement procedures, see Part locations and location codes. Select your machine type and model number to find additional location codes, part numbers, or replacement procedures for your system.

This ends the procedure.