Some nodes in Lichee Cluster 4A have identical MAC addresses

[alansill]

Two of the nodes for our Lichee Cluster 4A arrived with MAC addresses that are identical with the MAC addresses of other nodes. By trial and error we vound and removed these two nodes and the other five are fine. How can we change the MAC addresses on the two problematic nodes to get rid of this problem? Is there a script we can run to set the MAC address to a different value?