re-coding radio on 1997 Mitsubishi Montero Sport

Where can I find instructions to remove the radio so I can retrieve serial # to get the code to reset it

For 2001 model, remove plastic bezel around radio head unit.2 screws on each side. Slide unit out and model and unit serial number will be on a label on the top side. You will have to call a dealership service dept and they should give you the 4 digit code to unlock the head unit.