Event Number a3f | Spare request failed because a hot spare is already swapped in

Hello everyone,

Recently we had a drive fail in our VNX 5300. It has since been replaced by our warranty provider. However, we are struggling to understand one of the logged messages generated by the array - specifically, we would like to know if this is to be expected during a drive failover/hot spare swap, or if it is reason for concern. The message was as follows (serial blanked for security):

This message was generated by the EMC VNX 5300 storage array because a warning, error or critical condition occurred. Please review the message for any actionable items.

Time Stamp 08/31/17 04:21:08 | Severity Critical Error | Host A-IMAGE | Event Number a3f | Storage Array APM00000000000 |

Message: Spare request failed because a hot spare is already swapped in.  You cannot proactively spare a drive that is already swapped in.

This message was generated by the EMC VNX 5300 storage array because a warning, error or critical condition occurred. Please review the message for any actionable items.

Time Stamp 08/31/17 04:21:08 | Severity Warning | Host A-IMAGE | Event Number 801 | Storage Array APM00000000000 |

Message: Soft SCSI Bus Error

This message was generated by the EMC VNX 5300 storage array because a warning, error or critical condition occurred. Please review the message for any actionable items.

Time Stamp 08/31/17 04:22:06 | Severity Warning | Host B-IMAGE | Event Number 820 | Storage Array APM00000000000 |

Message: Soft Media Error

There are about ten additional log entries in the message regarding soft media/soft SCSI bus errors.

The same array had a drive fail about three weeks prior and the hot spare operation was initiated manually; it is entirely possible that the SA (myself) missed a step in the process. I hope that is not the case, but any help understanding the source of this error would be most appreciated!