Honda Civic EP2 Gearbox Issue?

Hello,
My Civic EP2 recently got a reconditioned gearbox and clutch last year. Prior to getting the work done, it would make a sort of hissing noise when the clutch pedal was released.
After getting the gearbox and clutch replaced, the noise stopped.
Fast Forward a year, the noise has started to come back, and is really starting to bug me.
Surely it won't need another gearbox and clutch?
I paid around £700 for the work last year, which I though would of sorted the issue.

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