Oh!... thanks for your help. It's finally starting to make sense now... at least the OS revisions are.
It looks like I'm up to date with the Speedo cals... but for the record here's what I have outstanding:
Calibration History for: Operating system
Part Number CVN Bulletin # Description
12588012 00000D5E - New software to improve idle stability
Calibration History for: Engine
Part Number CVN Bulletin # Description
12591968 00001D2F - New calibration with diagnostic enhancements for DTC P0130 and P0506. Also improvements to fuel trim and EVAP diagnostics.
12588569 000059A8 - New calibration to improve idle stability
12582726 0000AE66 - New calibration to correct problem occuring at the assembly plant. Does not address any service issues.
Calibration History for: Transmission
Part Number CVN Bulletin # Description
12588580 00000B26 - New calibration to correct cold start/shift problems
12583073 0000652D - New calibration to improve transmission shift quality
Calibration History for: System
Part Number CVN Bulletin # Description
12588589 00005A32 - Enhanced Calibration for Cooling Fan Noise Reduction
12581579 0000D550 - New calibration for improved fan control