Update on problem
This morning I started checking the electrical system and could not find a problem. Previously I ran a jumper from the battery to the ignition coil and the mower started. I tried that again this morning and it would not start. I checked the coil with an ohm meter, the primary side checked to factory specs however the secondary side was faulted. Evidently the coil was breaking down and finally went shorted out. The local Kubota dealer in Columbia MO didn't have one in stock so I called CK Power in St. Louis and had it shipped.