Our built in AEG micro/oven has stopped heating food, makes a lot of noise instead . All other functions work such as grill/oven etc. Thus far I’ve tested everything and all seems ok, obviously it’s not !! However on closer inspection of the magnetron , I’m not so sure this is what it should look like!! Looks fried to me albeit no shorts to earth!!HV capacitor is fine and the Hv diode swapped out as well. New magnetron is £65 from AEG, which is reasonable enough to repair and put back into service , assuming it’s gubbed !!