Like others have said, make sure the DMD is nice, otherwise very expensive to replace with a new one (or the new alternate route of putting a TV in w/ mini pc). The board that control's frank's head movement is up to $200 if missing/busted. Underneath the Playfield, by Frank, make sure its there.

MSF is my favorite Sega pin and i've had quite a few of them. Part of why I like it so much is the theme, which I think is implemented perfectly between the artwork, music/callouts and animations on the DMD. It has a really common layout, but many of the other games that use it are much more expensive (Funhouse, Tron, Xmen), Jurassic Park is the only one in a similar price range.