I purchased this game off Craigslist for $225. It was complete, extremely clean and semi-working with the girder graphics missing.
In addition to the missing graphics, the screen was washed out too!
This has the earlier 4 boardset version. I switched out the ROMS hoping for an easy fix but that did little to get it back working 100%. Another 4 boardset version of DK showed up on eBay being sold as untested. I figured I could swap boards to try to narrow down what was causing the problems. I ended up getting the boardset for approx $35 and eagerly anticipated its arrival. When it finally showed up I put it in the cabinet and it fired right up.
Some new t-molding (www.t-molding.com) and a repaint of the black metal pieces and the game looks great. I also added the DK2 and Hi-Score save kit ($79 at www.arcadeshop.com) and a reproduction joystick ($49.50 at www.mikesarcade.com).