I need a maintenance guy for JD 401D

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I have a 1970's 401D (2WD, Gas engine) and need a guy to help me with maintenance issues -- nothing major, just someone to help out with all the stuff oder tractors need. I'm in northern California (western Sonoma County) and would need someone to come out to my place. Does anyone have any leads on someone knowledgeable in the Santa Rosa area? Any help would be much appreciated. Thanks.