Frank1940

You might be being bit by this:

 
 
This is a part of the 'Help' screen for    Settings >>>  Management Access     screen

You could try to disable the MB NIC using the settings in the BIOS.   That way, your new 10Gbs NIC would become eth0.   (You would probably also have to rename (/delete) the network configuration files in the   /config    folder so that Unraid builds new one(s) on the reboot. )

This is your answer!   You are going to have to shut the server down to remove the bad anyway.  BUT before you start, print down the 'MAIN' page of the GUI.  Then as you remove each drive, look at its serial number and mark the drive position with the disk #, parity or cache  so you won't have the same problem again.