Quick questions guys, I am kind of confused, do I need to replace a bulb or is this a housing/fuse problem? Thank you.

 

It's the whole unit. Order it now at Bell Lexus Scottsdale parts. Low prices, and a sale just started for 10% off and free shipping:

https://www.clublexus.com/forums/ls-...placement.html

Sadly, the days of $5 bulbs are history. I have replaced both my trunk mount assemblies, most likely due to the jostling. 2003 was the last year of incandescent bulbs.