Yes, the tray that shapes the ice within the icemaker. I could not believe how bad it looked after all these years of finding flakes in my ice. I was drinking the non-stick lining all that time!

I just received a reply from Gene, a APP volunteer, who emphasized to me that I should not just change out the tray - it is a more complicated repair than it looks in getting the icemaker to work after.

For mine, the icetray was $70 - for $120 I replaced the entire icemaker: it was an easy repair (old one slides out after removing 1 screw) and now I have a new icemaker motor/setup as well. That was what I did even before Gene told me. The $50 extra was worth it in my time (and possible ongoing problems).