So I cleaned my P61A today. I purposely waited to clean the fines box until I reached the one year mark (13 months actually). It was my own little test. I know....I'm whacked. As has been mentioned here a lot lately there were pellets mixed in with the fines. I never had a single pellet in the fines box of my Invincible RS. Anyway for those of you using the likes of Stove Chow, NEWP, Green Supreme, etc, in your Harman you should clean the fines box ANNUALLY, if not sooner.