The failing component is the system backplane.
After you have replaced the part, set the enclosure serial number before powering up, otherwise the machine will not IPL. See the system unit service guide for more information regarding setting the enclosure serial number.
Use the table below to find the service information for the specified FRU.
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, 9117-MMA | 03N6902 | System backplane | Un-P2 |
This ends the procedure.