Hold on there boyz. One of those pins moves via the fire button action n is normally slow. The other bad news... All that linkage runs dry so you aren't cleaning anything there.

Most problems are the pins of the revolving back. Either bent or dirty as a result of laying the camera on the rev back.

Best bet is to push the pins manually n inspect em for damage. Then a very tiny drop of WD40 is all it would need to lube it.