TC reported unusual metal clanking soundcoming from the undercarriage in the Front DT driving cab 3 715. Video was taken and send to TOCR and later forwarded toDuty CC. TC reported unusual metal clanking sound coming fr  ~~~~~ 429 3715 TC reported unusual metal clanking sound coming from the undercarriage in the Front DT driving cab 3715. Video was taken and send to TOCR and later forwarded to Duty CC. (CE:3715 Wiper Control have no Water. Suspect the Clanking Sound Comes from the Water Tank Cover not Secured).  3715 found wiper water tank cap not installed, filled up water found water elvel gauge water leak, replaced new still leak. Remove water level gauge and blind off. Fill up water and function test wiper and washes ok. Done by: Asruddin and Zulqarnain. 22/07/2024.