Sweet looking cat.....
The chipped teeth on the R&P can be an issue.....These types of diffy's can create junk (Thrust washers that go away....then pieces go through the gears....OR bearings and then if big pieces get loose....ALL BETS ARE OFF...
Depending on where the chips are and how large....You can use a die grinder and a stone to smooth the chipped edges and call it good.
If the chips are large.....A new gear set is in order...
My OC-12 had a few small dings but nothing bad.....Smoothed the areas up....cal it good.
I do not know about new gears for the Skidoser....But no matter....The R&P are not cheap....Maybe a good used set.
I would HAVE LOVED a fresh set for my cat,,,,,The 5.44:1 gears are very scarce
Good luck on the kitty.....
Fun stuff