Hi Wotto

Here's a link to a stern service bulletin about this problem

http://www.sternpinball.com/downloads/sb106.pdf

You can also make the cable if neccessary.

Don't worry. I'm sure your mate will be impressed with your technical abilities.

Edit: Just noticed Greg has the upgrade cable in stock

http://www.rtbb.com.au/catalog/product_info.php?cPath=22_85&products_id=2725