PLEASE HELP, Anyone got the codes for Sony cd players?

My cd player requires a code and i've lost it, i had a list of them, i think it was something like 'source, mute, ATT, open/close' but everything i've tried hasn't worked, i've had to replace the batteries in the remote i've tried so many times :)
The thing is i don't know the model and serial number because it's hidden behind the face of it and the anti-theft is typically annoying.
PLEASE HELP ME, anyone?