See here's your problem, it's not so much that the light doesn't come on, it's that if it's not coming on, then it's not actually a light, it's something else.
I suspect it's a bulb.
( mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 14 Aug 2023, 21:03, archived)

There's a fresh bulb installed so it isn't that.
The extractor fan comes on. It's almost certainly a rusty 555, absolutely certainly a pre-existing short circuit in that area too.

Thinking about it, it might have always been an increasingly rusty 555. The flattard flicking the switch constantly might have saturated the IC somehow..? Like maybe the 555, if it even is one, has no means of discharging or is otherwise frozen/fried in a state of illogic.

I hope it's a 555/556 or something easy to replace. Worse case scenario it's a black blob. I hate black blobs.

BRB KLAXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX0N
( brb Monkhouse Stampede, Mon 14 Aug 2023, 21:16, archived)

Then I guess it's the bulb like you said

( mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 14 Aug 2023, 23:07, archived)