Dead microwave, part 2

[hearthstone]

So the microwave has been (apparently) working just fine since I last mentioned this. Then, today, I put in some sausages to cook for our lunch--you know, sausages, non-metallic sausages! Almost immediately we got the sparking, and I rushed to turn the thing off. On the right side now there's a long black smudge, and it looks like the plastic coating has disappeared from a rectangular spot.

So presumably it was damaged and eventually normal use finished the job?

I guess we're in the market for a new microwave after all. Luckily a low-end model will suit our needs.