NetAPP FAS3210报错，请问是什么问题？

NetAPP FAS3210存储扩展柜DS4243报以下错误，请问是什么问题？
NAS1> environment status  
 SAS Expander Module installed element list: 1, 2; with error: 1, 2
NAS1> storage show fault
Vendor Unique Element 83-IOM3:
Element Status                      Status Bytes  Status Descriptions
  1 [IOM3 A]    : NONCRITICAL       03,0C,00,00   BACKPLANE VPD FAULT, MASTER
  2 [IOM3 B]    : NONCRITICAL       03,04,00,00   BACKPLANE VPD FAULT