Rod Spohn

I was opening the rear passanger side door to let some one in and the handle came out in my hand. Seems weird since this is probably the least used door. Anyway, I can't see anything broken but there is a screw on the rear end of the handle that may have just vibrated out. This is on my '96 S320. Does anyone have any idea how to access that screw and if there is anything I should look for. Is there a diagram out there or anything so I can see if anything else feel off etc. I'm hoping it doesn't require taking off the door panel since I wouldn't want to take a chance at messing it up getting it off. Body type repairs are just not my fortay. Anyone - anyone
Thanks