It was actually his Wife who contacted me to repair the machine. She thought it would be a great birthday present for her husband.
I finally got it working properly today - found quite a few wires that had become detached from the contact switches (not broken off, the solder came away from the switch!). Also repaired a burnt out coil, and found a burnt out wire in the main relay bank. Then had a shorted globe socket causing one of the fuses to blow when that lamp was lit. I've also done all the usual things needed on an old EM - like cleaning up the contacts.
So now it is on to cleaning up the playfield (using Gavin's idea's to remove the mould - thanks Gavin!).
I will take some pics of the cabinet, backglass and inside the cabinet in the next couple of days. Unfortunately, the cabinet artwork has been painted over with some horrible colours. I did quote to restore the artwork, but they refused it. So it will only be repair and clean - a damn shame!