When using the microwave it made a frying sound and completely stopped working. Took cover off (after unplugging) and found filter coil solder joints fried. Took a chance on replacing filter. Works perfectly now. Looking at the solder joints again, under magnification, discovered they were not done properly in the first place. Use caution with cover off, there is a capacitor near the filter that could prove dangerous. Also need tamper proof torx bit to remove 2 of the cover screws, or small pliers but they will scratch the cover.