Teradata 13 -- ETL Testing

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Teradata 13 -- ETL Testing

Hi,

         We Recently Upgraded from Teradata 12 to Teradata 13 which was installed successfully and running fine, Now we planned to do the ETL/Data Testing, Asper my understanding I guess we need to check the Informatica Connections, Teradata utilities like (Fast load,Mload,Fexp et...)

I heared some time back that there are some data transaformation issues like data type conversions, I'm not sure about this, 

So pelase help what are the areas that we need to test???