Look here for information about FWPCI6 symbolic FRU.

The last character of the progress code (checkpoint) in which the system is hanging indicates which PCI slot the system was probing at the time the hang occurred. For example, E251 indicates PCI slot 1, E252 indicates slot 2, and so on.

For the PCI slot identified by the progress code, perform the following procedure:

1. Power down the system.
2. Reseat the adapter in the specified slot, then power up the system. Does the problem occur again?
   • Yes: Go to the next step.
   • No: This ends the procedure.
3. Power down the system and remove the adapter from the specified slot, then power on the system. Does the problem occur again?
   • No: Replace the adapter that you removed. See Managing PCI Adapters, order number SA76-0092 for PCI adapter FRU part numbers.
   • Yes: Replace the backplane that contains the PCI adapter slots, 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
     	8204-E8A	10N9369	System backplane	Un-P1
     	9406-MMA, 9117-MMA	42R7352	I/O backplane	Un-P1
     	5790, 7311-D11	80P6626	I/O backplane	Un-P1
     	0595, 5095, 7311-D20	39J0515	I/O backplane	Un-P1
     	5796, 7314-G30	10N7677	I/O backplane	Un-P1
     	5094	39J3058	I/O backplane	Un-CB1

     This ends the procedure.