Converting t6.1 to camper and got pop top fitted with internal led lights. Fitted ply lining using screws but now brake lights aren't working. Message says check left brake light then check R brake light. Fuse appears to be OK. I don't know if it's a coincidence but it felt as though it happened around the time I pushed the internal load area light button (which had been disconnected after pop top fitting). Any suggestions? May I have touched a wire with screw when ply lining? The wires in cavity were loose fitting so thought they would have moved if screw hit rather than resisting to the extent screw would go through. The cruise control is also no longer working. Any help appreciated