JB4 reading codes after they have been deleted

[NJ1]

Ok, so I recently deleted all codes using the jb4 so that I could bring the car to the dealer for a oil change. Problem is I still need to see if certain codes are still persisting. How do I get these codes to show up again? I looked on N54tech and couldn't find anything. Do I just disconnect the battery for a while?

Thanks in advance

Edit: Emailed terry and he says they are gone forever. I am just learning the hard way when it comes to modding.