Quoted from McCune:.....stuff happens to wood ! All kinds of things can cause your issue, like, humidity or lack of humidity or temperature changes .
+1. As others have stated, I doubt very much an operator would raise this as an issue expecting Stern to address; the "retailer" selling it to you for HUO, that's another matter.
If it were me, I'd push for a new PF that I would install myself. In my case it would be a double win because I like PF replacement projects. Stern's actual cost on the PF would be minimal and no one eats the labor charges to do the swap. Plus, if this is a long-term keeper you could have the PF CC.