Westinghouse fixed WRJ900US range hood light help please

[allover]

My wife has been nagging me to fix the lights in the range hood, some time back some thing went crackle pop, i changed the bulbs but with no successs. I have just pulled the switch assembly part and checked the board, removed the light assembly but all looks fine to me but i am no expert. Googled and although people had similar questions there did not appear a diffinitive answer, although some one suggested the transformer be replaced but i don't think one exists
Should there be a fuse some where or what should i be looking for? the wires appear ok

[iwacelect]

Is this the type that switches on when you open it?

If not power it up, grab a multimeter and see where the voltage stops in the circuit, and there you have it!