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I feel like the EVTM or factory service manual would give some ideas on where the locations of the grounds would be visually, if you are looking for a manual in print they seem to be for sale on eBay unless you have a connection that can find one or if a used bookstore/library happens to have one in stock.
If you are in a pinch for time with an active internet connection available, I was told recently about a website called Operation Charm that apparently has free manuals and diagrams available. I am including a link