As already mentioned, the TV codes are fixed and the auxiliary functions are changed by inputting a new code - there is no true default.

N.B.
It would appear that Insignia TV models NS-PDP42 and NS-PD50 were originally supplied with either of two non interchangeable remotes - the MKJ39170822 and the 6710V00151W - and by non interchangeable I would imagine it's to do with function availability rather than codes used, as the auxiliary device codes and input methods are seemingly the same.