WE have discovered that work order was finished and shipped against a sales order with the wrong serial number entered.  I would like to fix the serial history in DBA.  What files do I need to change in maintain database?

YES... IT WAS A WHILE AGO.

Those files fixed it, thanks!  I had to make sure I changed both transactions in the invtxn file, both the work order finish and the sales transaction.  The other tricky part was changing the serial number in the serial file by changing the Key code, not the serial number.  Changing the key changes the serial number automatically.  Changing the serial number first does not change the key.