What's the part?

[SamK]

2008 R1200RT
There's an electrical part under the left cylinder which is an off white colour. It can be seen from the rear of the cylinder. This part has started smoking when ignition is switched on but we don't know what it is. I've tried on realoem.com but can't find it.
Sorry can't show an image just now as I'm on my mobile.

Thanks
Sam