The derailleur had a stick jam into the cage that affected the shifting. I replaced the cage and pulleys and it worked for the most part. There was still some ghost shifting, but it worked. I'm unsure if that was caused by the damage or an aging shifter cable/misaligned hanger. I continued riding it until I tore down my mountain bike to sell. For that reason, I'm losting as parts only. Derailleur does have some dirt on it in hard to reach spots.