Oven Light not working

I have a Bosch oven that the light inside the oven is not coming on.
The oven works fine, I bought it new from a user on Ebay( not a shop ) about 2 years ago.

The light never worked from day one.
The bulb is ok as I bought new original bulbs and swap it but it still not coming on.

What shall I look at please before I replace it as it is for a rental?

Check terminals that make contact with bulb are ok and are not bent or broken off.
Then check there is power to light fitting.
Easy to get inside ovens so follow wire and check it's connected inside oven.

All fixed thanks. One of the wires going to the bulb was not connected.