Hello, I would like to replace the interior lighting with LEDs in my V50 (Mj2012). I also got matching sets on eBay and Amazon. Everything fits and works wonderfully – in the trunk, in the roof sky fond lighting, in the footroom, in the glove compartment. Only the front four lamps (top in the roof sky above the switch lever, two pieces for “door-on” and two pieces for reading lamps) simply do not want to shine. The bulbs are W5W according to the imprint, the LEDs too. But I put the pears out of the sockets and plug the LEDs in, nothing more. I switch them off again for the pears, the light goes on. What could this be about??? – Turning the LEDs because of +/- I did of course – Switch on/off/a too – I’m also grateful for every tip.