My 13 year old Frigidaire electric wall oven (model number FFEW2725LBB) threw a code F10 recently - runaway heating. I let it cool down and tried again but same code came up. Bottom element is not turning on and top element stays red hot after operating temperature is reached. I can probably fix this with a you tube video, but I'm hoping someone can tell me what parts I need just from my description of the symptoms. Sensor probe, bottom element, new board? Thanks!