Only the score illumination lights are always on:
Mibs lights (resized).jpg
The four bulbs behind the name (and the match lights) only work when the XB/Game Over relay has tripped. The Tilt light only works when the TB/Tilt relay has tripped. If those relays trip and the lights don't come on check the switches shown above.
Locks can be found at Pinball Resource, Marco, Pinball Life, ebay, etc. Just beware that they come in several lengths so you'll need to know what length lock you're replacing.
/Mark
