Today our over-the-stove / range hood Whirlpool MicroWave made a brief spark sound, after which we briefly smelled a burning odor.

Now, it will still heat, but just barely. It takes about 4X longer to heat anything.

It sounds normal when it runs, and everything appears normal, it's just not creating as much energy as it used to.

I would love to be able to fix this myself by replacing a part.

I appreciate this forum, and have purchased parts for other appliances here.

Thanks in advance for your recommendations.