I have a Workshop Manual but I don't have an index. Does anyone here know what Porsche's numbering system or group system is? For example, Mercedes-Benz has used a Group System at least since WW2; Group 42 is Brakes, Group 68 is interior, etc. In their case the same system applies to the Parts Catalog too. It would be really (!) helpful when sorting through the nearly 4,000 pages
. I have figured out that the various jobs have a WM number, WM130xxx applies to cooling system jobs, for example. Anyone have any experience?