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How to make cistern flush. Grohedal push button?

The lavatory can not be flushed by pressing either the short or long flush button. Air bubbles emerge around the flushing unit , indicating a leak underwater. Can the unit be removed to replace any parts, easily. The cistern is mounted behind a tiled stud wall, the only easy access being via the service aperture.Does the flushing unit detach readily?
Roy, December 2012