Had opened it up earlier and could see that transformer was not discolored. This particular oven has a built in "toaster" oven in the bottom, has been discontinued, and the kitchen cabinet had been specifically built to fit it's odd shape, so I figured it was worth a try to repair. Magnetron was the most likely culprit, with capacitor right behind, so I went for the trifecta. Relatively easy to install, only special tool needed was a tamper proof Torx for the screws in the back. Getting the strap on the capacitor was a bit tricky, had to remove the fan assy for access. Whole process took less than an hour, and it's back to like new performance. Happy wife, happy life!