I had a lesson today, and at the end, we talked a little bit about maintaining trickier pieces and things to do for pieces that need a little more attention to maintain. Besides playing backwards, and also slow play (both of which are techniques I've already been using) she talked about playing the piece in your head without the score, and also playing the piece in your head with the score.
This is something that has been talked about on PT in the past, and there are some pieces where I feel I'm able to "play it in my head" fairly well. But with my jury piece, I could not get the piece into my head, IOW I couldn't call it to mind, and to me that's a sign of how this piece is harder for me.
Anyway, she suggested playing two measures, and then going away from the piano, into another room etc., and singing that part out loud. Then return to the piano and do a few more measures, play, then step away and sing. Go through the whole piece like this, a few measures at a time, until you can audiate it more reliably. Or, if time is short, just do that for specific sections.
I really liked this suggestion because it gives me an intermediate step, a way to practice what might otherwise not feel possible at all.
We'll see if it helps me do a better job of maintaining my jury piece. And maybe I'll see if I can develop my audiation skills more generally. My teacher said a lot of people use this to learn music away from the keyboard, and even if I'm not able to do that, it seems like a useful skill to work on.