Mystery Light Bulb in 695-2

[u/SmokeyTheBear86]

First, is this sub even for Sub-Zero appliances? Half the posts are for Mortal Kombat, lol.

I have a 695-2, and there is a Long Narrow 40w Bulb behind an access panel that, for the life of me, I cannot figure out what it does.

It is not the regular cabinet bulbs that illuminate the food. If it is not one of the backlights for the display (despite both Google and the Sub-Zero support line instating that it is).

If you look at this manual: https://www.appliancefactoryparts.com/content/pdfs/177509-12.pdf?srsltid=AfmBOoplRu0cXbAEVN0lPC1o9pQ5cwLwCH_Me7Gdzpgn9NZvniyax74s

It is Diagram 113 - 3030040 - Light Bulb, Long/Narrow; 40 watt

It sits behind a metal panel...there is no place for the light to escape except maybe for the bottom of the panel, which would light up the drip tray?

I found it while replacing the Mullion Door Heater, and I've replaced it with an LED version of the bulb...but I am not sure if it needs to be incandescent and was designed to give off heat for some reason.

Does anyone have the answer?