Location of Dynamics AX Service accounts in SQL

I'm writing a script to change settings within AX depending which environment it is in (Test, Dev, Prod). I have everything good to go except the BCP account entry. I have not found it in the Database, so wanted to know what table to look in. This way if I need to move live data from Prod to Test, all I need to do is run the script and changes all those settings to the Test settings. Any help would be appreciated.