Sora STI shifting problem

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Can anyone help?

I've problems with my right hand shifter, Sora 9 speed. All was fine until I was out on a ride, and for whatever reasons it stopped shifting. The lever moves, but no longer clicks.

I've since replaced the gear cable, even had a new rear derailleur. The lever moves the derailleur and pulls the cable accordingly, but rarely shifts up or down. If I spend a few minutes moving the lever about it does occasionally shift up or down.

I tried WD40 on it to no avail. Any advice appreciated.
 
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