You are looking for a specific answer and i get it. But for one problem there can be multiple solutions.Haha Give it one more try, I’m sure you’ll win this time! Promise, I won’t change the question this time!![]()
Checking light through door cracks or key hole.
Keep switch on for a while does it get warm.
Flip switch several times to see any spark
Open the panel and check with tester.
Slide in photosensitive film under the door and try, which switch changes it.
This can go on forever...
Pick any that suits you or wait for someone to comeup for the answer you are looking for.



