"LASERandDVDfan" wrote in message
...
I may have exaggerated the size a bit, looking at it now it is about 1
inch
long, and about the width of a penny, maybe a nickle, but the edges do
curl
up _into_ the oven cavity, and arcing is a very good point.

If you are unsure, just go ahead and replace it.

Prolonged exposure to microwave energy of the amplitude generated by a
microwave oven could cause leukemia. - Reinhart

Would probably be worth salvaging the control board, power transformer,
magnetron, etc from the unit though as they're all quite new and could be
used to repair other units. If you take the microwave to an appliance repair
shop they'll probably happily take it off your hands for parts.