Tailgate slide is cracked to hell!

[Ronan]

I'm not sure what the piece is called but I'm referring to the part of the tailgate that slides when you drop the bottom part of the tailgate.
Lately, I noticed a crunching/ctacking sound when dropping the tailgate. I examined it and found the plastics hinges were snapping off. Now it has completely come off in my hand.
Has anyone else experienced this? If so, do you know if this is covered under CPO warranty? I only have 76k on the clock and this appears to be a materials defect.