Dash Questions

Hi. I've read alot of post, but this is my first.I just purchased a '91 Park Avenue and I need some help. First the door ajar light stays on and all doors are closed and locked. Can I just remove the warning bulb and how do I get to it. Second, I have to replace the radio and need to know how hard is it to do the R & R . How much of the dash needs to be removed ?

Thanks in advance and hopefully I can answer a question or two for someone someday.
 
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