I've got a 2003 C3 and just noticed that the reverse lights are coming on when reverse is engaged. I've tried changing the fuse (although the original fuse looked fine), I've also taken the rear light clusters out to check the connection and the bulbs. I've not been able to switch the bulbs out yet as I have no spares to hand. But the bulbs all look ok (the little piece of wire across the two "arms" inside the bulb are intact). If the bulbs turn out not to be the problem what else can I check? I'm guessing at the end of the day its just a bulb and a switch with a fuse, so I'd guess I'll need to check the switch and also the connections. But I'm not really 100% sure where the switch would be or if there's anything else I should be checking. I'm mostly trying to avoid the costs of getting this sorted at a garage so I can pass my MOT. Thanks Tom