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@graeme_the_bike_tech
There are several things it could be - broken G springs, cracked spring mount ring, failed location for the return spring (also part of the spring mount ring) or failed return spring. You can return it Velotech Cycling Ltd, the main UK Campag Service Centre for a strip, clean and rebuild - costs are advised ahead of completion once it's stripped to see where he problem is but typically you'd be looking at around £40.00 - £45.00
If you are looking at doing it yourself, and found broken G springs, we'd recommend replacement of the spring mount ring in any case - often, that's the next tghing to fail & in any case, when the lever has been in use for some while, the G springs form a small indent at the point where they meet the mount ring, so become less likely to hold the gear, especially on the last few clicks towards bottom (easiest) gears.