Motherboard replacement in T5440 caused vsw0 plumb issue

We recently had a motherboard replaced in a T5440, and now vsw0 will not plumb up. We suspect it's because the MAC address has now changed for nxge0. Below is what we think we should run to reconfigure vsw0.

# ifconfig nxge0 plumb

# ifconfig -a                               (example below)

lo0: flags=2001000849 mtu 8232 index 1

        inet 127.0.0.1 netmask ff000000

nxge0: flags=201000842 mtu 1500 index 3

        inet 0.0.0.0 netmask 0

        ether 0:14:4f:c9:e3:ba                <---------------- EXAMPLE MAC ADDRESS

# ifconfig nxge0 unplumb

# ldm add-vsw mac-addr=0:14:4f:c9:e3:ba net-dev=nxge0 primary-vsw0 primary

#  /opt/SUNWldm/bin/ldm list-domain -o network primary

# ifconfig vsw plumb    

Any thoughts?

Thank you for your time...