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Oh, hang on you mean it won't go from second highest to highest, even though the cable is slack? Have you tried opening up the H limit screw? Sometimes it can get close but not close enough to complete the shift.
Also, eyeball or tighten the cassette to make sure the cassette cogs all have the same gap and it's not loose.
hippy
Down the block, into a higher gear. Cable is hanging slack, jockey wheel in correct position below highest gear, chain won’t release second highest gear sprocket.