I don't know where is this page it should be in tutorials but here are the codes
M00I=M11I Arena selection background
MASI = Arena selction pic
SSFA = Selection Pic in match
SSFB = Selection Pic in menu
SSFC = Selection pic in WWE Universe
SSFD = Wrestler icons
CASI Created a Supestar background
TITI = start screen
RTWM = Road to WM section
crdi = Credits on wrestlemania