The problem is a system I/O control logic problem.
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 |
| 221 | 8203-E4A, 8261-E4S, 9407-M15, 9408-M25 | See System parts. | System backplane | Un-P1 |
| 221 | 8204-E8A, 9409-M50 | 10N9369 | System backplane | Un-P1 |
| 221 | 9117-MMA | 42R7352 | I/O backplane | Un-P1 |
| 221 | 9117-MMA | 03N6902 | System processor backplane | Un-P2 |
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