Picked up a completely dead Bally Mata Hari from a barn, no backglass, boards were toast, and it looked like mice had been living in the cabinet for years. Wiring was chewed, rust on just about every metal part, and the playfield was flaking badly. Took months of cleaning, board swaps, touch ups, and tracking down parts, but I finally got it playing 100%. Not perfect, but super satisfying seeing it come back from the dead.