lights dim

Over the last week or so I've begun seeing signs that something on my KitchenAid KMHC319ESS4 microwave is about to fail. Problems began with an off-and-on dimming of the over-range lights. Now the vent fan has also become unsteady. The motor will slow and then pick up again, slow and pick up...

I have a five year old Whirlpool WRX988SIBM03. A few months ago, all of the LED lights went dim. My wife said she could live with it, so I didn't pursue a fix. A few weeks ago, the lights flicked like a strobe light when the door was opened, then after a day it stopped. After doing some...