The bulb has been changed and the fuse for all the interior lights is fine (the lights all work), so I'm guessing there's some wiring somewhere that's frayed or something. Would fixing this be more hassle than it's worth? I know squat about wiring and electrical systems/circuits other than completing circuits, +/-, and V=IR (though I've done some soldering before) and I know nothing about the going ons behind interior panels.
Not afraid to mess around back there though if it'll fix something and I learn something new.