If you are currently using AXP 1.5.2 installed on a Bryce (NME) service module, please be absolutely sure not to downgrade to the older AXP 1.5.1 release as a bug in that version will cause the mac address on the service module to disappear.  This issue can occur in both a clean or downgrade install when moving from a later version of AXP to release 1.5.1.