Quoted from justjoe13:shame that someone doesn't have replacement boards for those machines like Rottendog makes. =(
Someone does! Gorgar is a Williams Sytem 6. You can find replacement MPU and driver boards at http://www.pinballpcb.com/index.html
Direct link to MPU: http://www.pinballpcb.com/System3-7MainBoard.html
Direct link to Driver Board: http://www.pinballpcb.com/System3-7DriverBoard.html
Direct link to Sound Board: http://www.pinballpcb.com/System6-7SoundBoard.html
I can recommend these boards. I got the Driver and MPU boards for my Firepower, and they work great!