Closed the boot a while back, and eventually got round to replacing the bulb, only to find it didnt fix it. Did some digging, and found the cables are prone to being pinched by the boot hinge. The yellow wire was totally cut, and the other damaged. Soldered the yellow cables, and heat shrinked it, and moved the cables so they were in a different place. Used a rigid cable tie, pushed it through the conduit, and put the cable through the slotted end and pulled it through.