Peugeot 406 radio, need code, have S/N?

Hi can anyone help?

I have a '98 Peugeot 406 with the standard Phillips radio/cassette unit. The radio has worked fine the whole 18 months i've had the damn thing, i went to listen to it without the engine on and its reset the code!!!

Took the radio out as i understand the serial number is important:

Model number: 22DC594/65B
unspecified numbers: PHI1071653
: PHAPIFW1071653 (stamped onto side of radio)

would really appreciate someone helping out, bl**dy car!