I recently bought this house, and the oven light bulb wouldn't come on, so I assumed it had burnt out-- bought a new one and installed it. Now light won't go off, no matter what I do-- even tried replacing the old bulb and it stays on constantly, too. Tried turning on the self-cleaning feature since all this started after a spill in my oven, and it won't work at all. And I can't get the latch to budge at all. Suggestions?