The repair was very easy, however the bulb was not the same as the original one. The original bulb had a bright setting and a low setting, but the replacement bulb was only the low setting bulb. There was no bright and dim operation. The switch on the microwave had the duel settings.
I bought the microwave on sale at Sears. the glass cooking tray was missing. It was to be ordered but after 2.5 months I had not received it so called Part Select and received the tray within 5 days! Ironically, the original one arrived the same day. I would recommend PartSelect for their prompt and very courteous service.
Removed control panel, discharged HV capacitor. Removed old diode, tested to confirm failure. Replaced part. Other than the removal of the panel swapping the part was almost as easy as replacing a light bulb.