Now I may have imagined this but I'm sure I read somewhere that the Aura keeps up to 13 weeks of finished programmes at the end of the scheduled list. This allows for a series with the same CRID code restarting and it will be rescheduled again, also covers series that are not weekly so are not always in the EPG.
I've had my original Aura for over a year and the finished list is getting longer and longer with no apparent clean-up, but maybe I'm thinking of my original 5000T which I'm sure did manage the list?
Anyone any idea or is it a manual delete job?