right tail light problem

[jola1925]

Hello, when checking my lights I noticed that the right turn signal is not working, brake light is weak & light in general is dimmer.

I would like to start with simplest solution, replace the bulb, but looking at the housing I can't tell if I can pop off the internal black cover to get to t bulbs.

Does anyone know? I've included a picture..

I suspect this problem will be more than a bulb issue, but I'm 2 days from home.

Thanks, Jola