I have a Kenmore Elite microwave oven... 69-65e05590-000637. We noticed that it would not heat food or liquids... played with the power level a bit and it started to heat again...then a day or two later we started to smell something like burning wires while heating some food. Any help appreciated.

Is this oven still under warranty? If so, take advantage. If not, remove the power plug and the case. Short out, with a screwdriver, the large can-shaped capacitor with two terminals sticking out. Check the wiring and circuit board for signs of burning. If everything looks ok, remove the thin sheet metal wave guide that sits above or beside the microwave energy port into the cooking cavity. Under the sheet metal, there is a metal fan-like device called a 'stirrer' that has a plastic bearing. Remove this stirrer and smell the bearing. If it smells like the burning wire smell, replace the stirrer. You can buy it through 'Sears Parts' online.