The default mappings will be stored as .automap files. There are two sets, the factory defaults and user defaults.
On the Mac:
user: your_home_folder/Library/Application Support/Novation/Automap Universal/Mappings/"pluginname".automap
On the PC:
user: (system drive):Documents and Settings/your_user_name/Application Data/NovationAutomap Universal/Mappings
User mappings override factory mappings, so if you want to revert to the factory mapping just delete the user mapping. If there is no factory mapping the plug-in will revert to the order in which it lists it's parameters.