Rear tail light holder issues

[rburro2]

OK, This is complicated and I'll try to simplify it.

I have a 2000 Boxster 2.7L 5 speed

All bulbs and fuses are good.

My rear tail lights are not working properly. Brake lights work, Reverse lights work.

Drivers side:
Rear fog light works. Actual tail lights don't.

Passenger side:
Actual tail lights work intermittently. Rear fog light doesn't.

So my questions: Are there known issues with the bulb holders? Has any one had similar problems and what was the fix?

Roger