The mp3 player connection was installed years ago, it plays through an FM channel, the connecting cable needs to be replaced, how the hell do I get behind that Fort-Knox-like panel under the stereo?

what year,make and model?

Sorry, it's a 2005 Honda Element LX.

Audio Unit Removal/installation

NOTE:

Put on gloves to protect your hands.
Take care not to scratch the dashboard and related parts.
Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
Remove the dashboard center panel.

Remove the four mounting bolts, then remove the audio unit.
Disconnect the audio connectors (A) and antenna lead (B).
Remove the eight mounting bolts securing the audio unit to the audio unit bracket.
Install the audio unit in the reverse order of removal, and note these items:
Make sure the audio unit connector is plugged in properly, and the antenna lead is connected properly.
Enter the anti-theft code for the radio, then enter the customer's radio station presets.

OK, I'm going to give that a try, thank you VERY much.

that's why we'er here. good luck