CU2 Lux - Noise coming from drivers seat

Hi Guys,

Haven't posted for a while, happy new year to you all.

Just got a bit of a minor issue that's been bugging me for the last few months. I'm getting a muffled noise coming from the seat back whenever I shift around in my seat or when driving around a left hand corner. I've changed the lumber support into different positions but it doesn't seem to make any difference. The noise is a bit hard to describe but it almost sounds like your settling into an old rickety lounge chair. Could there be something loose in the seat back thats causing it ? It seems to be coming from the lumbar area. Has anyone else got this problem? Any thoughts would be welcome. Cheers.