I've been searching these boards for 3 days straight and I still can't find an answer.. And I'm about to pull my hair out!
I have a small half bathroom in my basement, toilet and small sink. Over the sink is a medicine style mirror with a 17" florescent light fixture over it. This past weekend the GFCI outlet, which feeds the light, tripped for reasons unknown to me. I naturally hit the test button 16 times with no success. So I killed the power and opened the wall box, switch box, and light fixture. It was set-up to protect the downstream devices (line AND load). I replaced the outlet and that didn't help so I pig-tailed everything together and attached everything to the line terminal and that brought everything back to normal.
However, I don't want to just leave it as is because there obviously is a problem. Without tearing the wall paneling off, I think the setup is: Source>GFCI>switch>light.... I pulled all wires off the devices and tested for power and GFCI line black wire was the only hot one...
Thank you in advance!