Aw you can do it yourself, not hard at all. I too had that problem when I upgraded my Ercoupe wiring. A friend suggested MS Paint I believe, installed on all computers, easy as pie. The FSDO sent me a note even when looking at the 337 that it was the best wiring diagram he had ever seen! Made me feel real good (even though the FSDO was my baby brother).
Look at this for a very first time quickie project:
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