lp2k
Had a couple of drinks.. saw a couple of things
Take some red scotch pad (used to scrub dirty pots) and scrub those areas. You should be able to reuse the shafts if the teeth are good but the scotch pad scrub over the the first gear needle roller bearing journal will make it smooth again. I worked in a transmission place for a little and it was my beginner job to scrub metal parts which had that scoring to get it smooth. All by hand