Not that anyone out there is listening or cares, but here's status of my issue...
First, I learned that my cheep MaxiScan code reader only reads P codes and the ABMS fault is a chassi code.
Secondly, I learned that the new AC Delco EBCM I'm looking to purchase will need to be re-configured by the dealer and the estimated cost is $140
Third, When I removed the EBCM, torx screws came out easier than expected, and disconnected it from the pump valve I reconnected the connector and inserted a new 25a fuse which blew. So I am now confident that the short was in the EBCM and not the pump valve assembly.
I just ordered a new EBCM and will report back when its installed.
Fingers crossed!!