When I recently placed a container of coffee in the microwave to warm up it started loudly humming and within seconds it began to give off a smell of burning plastic. I immediately shut it off waited a minute or two and tried again same results. I am hesitant to let it run for any period now. I cleaned out the unit thoroughly even though it wasn,t particularly dirty. The turntable revolves fine and is totally clean. If I am able to open it up the casing what should I be looking at or for.
Hank Fischer