I'm sorry I have no idea about the assembly; I hadn't thought to even look under there.
But I'm interested to know if it's really a bulb. I've read several places that the only bulbs on these cars are in the backup lights--everything else is supposed to be LED. Let us know what you find when you get in there.
(And welcome to the board, BTW.)
2016 V8 VIP+, black with white interior