Hi , I have purchased a house with a MAytag convection oven and there is no model # ..the oven is taking at least 30 min to preheat and i want to be able to fix this and the convection button seems not to be working either...i have sent a pic of the stove..my email is maria_bond75@hotmail.com and i would like a manual to see if i can have the oven fixed..my cell is 905-409-3240 Thank you Maria