A straightedge across the playfield will answer the warp question real fast. Stern has had a fair number of warped playfields lately. This is the first STh I've seen (if it is indeed warped), but I know of warped LZs and AIQs, both convex and concave.

Is this sudden cluster of warped playfields Stern cheaping out on the wood in the playfield blanks with an attempt at more "hidden" cost reduction that bit them in the ass? Seems possible, but we may never know. Hopefully they figure this one out. We already had enough to keep an eye out for with the pooling/chipping clear, now warping, too? Too much.