The path to the service processor might be the failing item.

Do one of the following:

• For the 9406-MMA or 9117-MMA, replace the service processor (SVCPROC) if you have not previously done so. If that does not resolve the problem, replace the backplane (SYSBKPL). If that does not resolve the problem, replace the processor card(s) (ANYPROC).
• For the 8204-E8A, replace the system backplane (SYSBKPL). If that does not resolve the problem, replace the processor card(s) (ANYPROC).