A:Answer The light used to illuminate the interior of the microwave is provided by an LED Lamp Holder Assembly, LG Part No. AEJ74859403. The cost for the part and shipping is in the order of about $30.
The part is quite easy to replace once one has removed the microwave’s cover, a task requiring a torx bit able to remove tamper proof screws. Remove the screws, slide back and remove the cover, and the part is immediately exposed and easily removed for replacement.
The part is shown in the attached photos, one side showing the part number, and the other the two LEDs that illuminate the microwave’s interior.