2015 ES 350 Tail/Brake light
 

I have a 2015 ES 350 and as you may know it has 2 separate taillights, one attached to the trunk lid and one on the rear corner. On my car the passenger side taillight that is not on the trunk lid has burned out both during the always on solid red phase and also when the brake light is on. I took the light assembly apart and I can’t find a bulb and I can’t find anything on YouTube. Can anyone tell me if I’m going to have to replace the entire tail light assembly just to have working brake lights on this side again? This seems very strange and a horrible design flaw, any help would be much appreciated.

Thanks