Honda Civic EP2 Gearbox Issue?

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.

Obviously you need a vehicle with an automatic transmission or to learn to drive a manual transmission. Just replacing a clutch and transmission won't make you quit tearing them up.