I haven't taken anything apart yet, other than removing grips and side plate. I'm waiting on the book that Chaffee recommended before digging into unknown territory too far.
From looking at these pictures, I am guessing right now that the small spring(?) that lifts the bolt is either missing or broken.
Well...I got it apart with no major issues and have cleaned off all the junk and varnish from the inside.
I was correct about the broken part shown in the diagram above. It looks like it had broken and been repaired sometime in the distant past. It broke again at the site of the repair.
I found a replacement from Jack First and it is on the way.