You might try posting on the KLOV forum, or one of the other arcade collecting forums, most of the arcade collectors I know are not into poker machines but there have got to be collectors out there who have them. People here can help you with general troubleshooting but most of them are not going to have expertise specific to a machine like that.
Is the display a CRT or LCD? If it's a CRT you could try degaussing it to correct the purple, but it's possible it took a hit that deformed the shadow mask.