lovely car, had a 99 with big motor and manual, back in the day. fun in winter in the snow and top down.
try this:
https://zroadster.org/threads/rear-lights-went-out-quick-question.37147/
I was actually hoping for a photo of the connectors to the lamp housing, I suspect that's the most common point of failure. but the thread above, it was some bad bulbs....you never know.