The whole service manual is kindly hosted by Olsen's ((no need for @RJT's kind offer): http://www.olsenstoy.com/searchcd31.htm?itm=672
Also, forum member, @Tranz4mr has wonderful page on ZWs: http://www.tranz4mr.com/ZW_Page.html (Each image this page represents a whole tutorial - so go through them all!)