1999 Chevy Astro BACK DOOR

Hi
Can anyone direct me as to how I find a parts explosion for the inside back door panel for my 1999 astro?
I need to take the inside panel off to get to the loose locking mechanism on one side of the door. The door is closed. This is for the upper door that sits over the double doors in the back.

Thanks.

ps; last week I asked about this issue and I got a response of haveing to rough up the inside panel
to get it open. I hope I don't have to do that.
The thing is I fixed it 3 years ago and I just can't remember how I got the panel off and the door open to fix it.