https://i90.photobucket.com/albums/k251/Captain_Black_ / DSCN0666.jpg
As you can see, there are 4 incoming red wires , and 1 yellow. There is also 1 red going from one terminal to another. Three of the red wires go into the same terminal, & it looks like it's here that the problem started (if you tilted the switch upwards & looked at it head- on, the left switch is for the single light, and the right switch is for the second light + the extractor fan).
What I don't understand is if this was supposed to *be* like this (and has been working as such), why this happened?
Can anyone offer advice?
Cheers ... Mark