Backup Exec 2012 Media server cluster issue

Hi,

We have Backup Exec 2012 media server in cluster,

Primary and secondary Backup Exec 2012 media server.

Few days before, the primary Backup Exec 2012 media server went offline, then backup exec control went to secondary Backup Exec 2012.

but once Primary backup Exec 2012 came back to online, backup exec 2012 control is still in secondary backup Exec 2012 media server, its not coming to primary backup Exec media server.

Can any one help on this issue, to fix asap.

Thank you