My 997 is Gen 1 (54 plate). Within 3 yrs of ownership (still only done 43K miles) the cabin air vents on driver side & centre broke in that the "side to side" movement of vanes isn't working. When in for service at OPC every 2 yrs they quote £200 to replace/repair and as they still allow air to come through I have declined their offer. Has anyone else had this issue & is there a cheaper fix? Are parts available & are they an easy DIY replace?