The problem is an expansion unit logic problem (I/O backplane). See the following table for the FRU part number:
| CCIN | Description | Model, expansion unit, or unit type | Part number | |
| 307 | 8204-E8A | 10N9369 | System backplane | Un-P1 |
| I/O backplane | 9117-MMA | 42R7352 | ||
| I/O backplane | 7311-D11 | 80P6626 | ||
| I/O backplane | 7311-D20 | 39J0515 | ||
| I/O backplane | 7314-G30 | 10N7677 |