Success codes for MDT

I'm currently updating MDT to 8540 and tackling a Windows 10 deployment.  In my research, I've seen a lot of articles that mention adding specific numbers to the Task Sequence area "Success Codes (suppress errors)".  They mostly reference the number "2" so MDT doesn't give an error after a reboot.  I'm looking to find a list of the success codes.  I've only come across "Error codes" in my searches, and none of those ever seem to match up.  Is there a published list of success codes anywhere?