The problem is in a mezzanine bus arbiter.
Replace the I/O backplane. Use the following table to determine the FRU part number.
| CCIN or FFC | Type and model | Part number | Description | Location code |
| 2D2 | 8203-E4A, 8261-E4S, 9407-M15, 9408-M25 | See System parts. | System backplane | Un-P1 |
| 2D2 | 8204-E8A, 9409-M50 | 10N9369 | System backplane | Un-P1 |
| 2D2 | 9117-MMA | 42R7352 | I/O backplane | Un-P1 |
| 2D2 | 7311-D10 | 80P2339 | I/O drawer backplane | Un-P1 |
| 2D2 | 7311-D11 | 23R0181 | I/O drawer backplane | Un-P1 |
| 2D2 | 7311-D20 | 39J0515 | I/O drawer backplane | Un-P1 |
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