IBM X3650 M4 PCI插槽报错，故障原因是什么？

操作面板PCI指示灯告警，查看日志，内容如下：
Index,Severity,Service State,Source,Date,Sequence #,Event ID,Message,AuxLog
1,E,3,System,06/19/2017 03:00:20.36,416,806F002130010902,"Fault in slot 2 on system System x3650 M4.",[S.2018001] An uncorrected PCIe error has occurred on Bus 0020 Device 00 Function 00. The Vendor ID for the device is 10DF and the Device ID is F0E5.
2,E,3,System,06/19/2017 03:00:19.943,415,806F002125820900,"Fault in slot All PCI Error on system System x3650 M4.",[S.68005] An error has been detected by the IIO core logic on Bus 00. The Global Fatal Error Status register contains 00000000. The Global Non-Fatal Error Status register contains 00004000. Please check error logs for the presence of additional downstream device error data.
3,E,3,System,06/19/2017 03:00:15.975,414,806F08132582FFFF,"An Uncorrectable Bus Error has occurred on bus PCIs.",
4,E,2,System,06/19/2017 03:00:15.842,413,806F03131701FFFF,"A software NMI has occurred on system System x3650 M4.",
5,E,3,System,06/13/2017 10:03:42.524,388,806F002130010902,"Fault in slot 2 on system System x3650 M4.",[S.2018001] An uncorrected PCIe error has occurred on Bus 0020 Device 00 Function 00. The Vendor ID for the device is 10DF and the Device ID is F0E5.
6,E,3,System,06/13/2017 10:03:42.414,387,806F002125820900,"Fault in slot All PCI Error on system System x3650 M4.",[S.68005] An error has been detected by the IIO core logic on Bus 00. The Global Fatal Error Status register contains 00000000. The Global Non-Fatal Error Status register contains 00004000. Please check error logs for the presence of additional downstream device error data.
7,E,3,System,06/13/2017 10:03:38.474,386,806F08132582FFFF,"An Uncorrectable Bus Error has occurred on bus PCIs.",
8,E,2,System,06/13/2017 10:03:38.248,385,806F03131701FFFF,"A software NMI has occurred on system System x3650 M4.",
9,E,2,Power,06/13/2017 09:10:39.587,368,800B01081301FFFF,"Redundancy Lost for Power Unit has asserted.",

请教是什么原因？该怎么处理