Last night we had a small grease fire in the bottom of the oven. I turned off the oven and I put out the fire with baking soda. I turned the oven back on and the heating element DID turn back on, for only about 3 minutes. Then the element turned itself off and will not come on again. The upper broiler element will also not turn on, though it did not get touched by the fire (as far as I can tell). External fuses are on. Indicator lights come on. Internal oven lights come on. Stove-top ignitors for the gas burners come on. Seems the only thing not coming on are the heating elements themselves. I suspect there's either an internal fuse that I can't find, or there's a safety override of some sort that needs to be reset. Any suggestions?