Well that's another problem crossed of list
removed centre console and removed front cover of air distribution box,
the flaps that control the centre vents where binding and there was a lot of wear on drum shaft.
filled corners of flaps a little and they now spin without sticking, had to repair the plastic lever that turns them as it had broke, not the best plastic to glue but managed to reinforce the break by adding bits of plastic.
All back together now and working great, hopefully the repair will last