34. If at any time during or after the completion of a specified work or a protective work, the Canal & River Trust gives notice to the undertaker informing it that the state of maintenance the work appears to be such waterway that the work is causing or likely to cause detriment, the undertaker must, on receipt of such notice, take such steps as may be reasonably necessary to put that specified work in such state of maintenance as not to cause such detriment.