Hog,
The Honeywell folks who we worked with were committed to develop the data base where the customers flew, did anyone ask them for updated data around where you operate? What type machine was it in? What model EGPWS? I only know of approvals in S-76 and AS-365 so far, could you have the older GPWS?
Here are some slides that talk about the concept:
http://www.s-92heliport.com/EGPWS.htm