Think the metal I found inside came from a foreign object introduced at some point in past. All parts are accounted for so far.
I have marks like this all over the inside of the case
I also found gear issue. One of the gears that slide to engage was stuck. Circled in red. Took it apart, inspected, cleaned it and now works perfectly again
Struggling to remove the two Phillips screws to get to shift drum. Manual doesn't specify anything other than 'remove'.
Maybe I let them soak for a while, maybe heat. Not sure yet.