rosieres paul bocuse 4040db ?

i have aquired a rosieres paul bocuse 4040db i think.

it has 3 lights on the front 2 orange 1 red .
Both orange lights glow ..the right hand one slightly more…when switch on right hand oven red light comes on…

but

when I switch on left hand oven or left hand grill ,the left hand orange light goes out and red light comes on but nothing works.
the fan works ok when i switch it on .

Both elements look fine.. can any one help ??? hope this makes sense

found the problem…

it was the selector switch