Have you set the clock so it's not on auto?
Can you check the E-Nr number? the one you've posted isn't a valid one.
Thanks for that.
Unfortunately there's no user manual online for this number so I can't look to see what the lights are.
Is it all of the lights that don't work?
Sorry, that's no possible.
There's no lighting in that part of the appliance.
I'm looking at the exploded view and there's nothing there.
The only lights are the columns of lights on the left of the display, by the timer.
I would suggest you check that everything else is working ok.
You've checked yourself and there's no lights and more importantly, no wiring for any lights.
Check your temperature light comes on and goes off when it should.
If it does, you've sorted out your machine.
Let me know what you find.
Your thermostat will have a +/- tolerance of 10 %
I'm afraid you're correct, a new element is controlled by the thermostat so wouldn't make any difference.
How old is the oven?
Put your oven thermostat at the top rear, as high as you can get it and check the temperature again.