I just picked up an old Toro "Pro-Cut" mower. Has a 12hp Briggs + Strtton engine, and 36" single blade cut, with 4spd trans. Starts easy, and runs great, but will be needing a lot of maintenance soon. Is there a place I can get a svce manual, or owner's manual for this? I don't have a lot of information as to how old it is, but I can certainly find out as needed.