The Powervault Manager in the Dell VA084 storage array is showing a Degraded Enclosure as well as a Degraded Expander.
These messages are visible from the "Table" tab when the System icon is selected.
Dell VA084 storage array
Dell VA012 storage array
This is usually due to a hardware issue with one of the controllers in the storage array.
Download a storage log bundle from the Powervault Manager screen and open a support case. Dell will analyze the logs and determine the next steps to resolution.