Dura Ace 9 speed shifter - doesn't !

chris48
chris48 Posts: 14
edited September 2008 in Workshop
as above , OK on last ride, put bike away next day the rear shifter does not change up the ratios .... there is no positive 'click' like there was before either.
I've taken lever off the body but cannot see anything.
Looking down inside the top having pulled the brake on the cable seems wound around the lever still ( i.e. the nipple is not visible and there is no way I can move/change the inner wire)
Broken return spring?

Any help please?
Thanks