551/552 Air leak test fail 1.0b/5mins found during DT check ~~~~~ 551/552 Air leak test fail 1.0b/5mins found during DT check  3511 and 3552 found horn magnet valve air leaking, replaced both cab horn magenet valve. Function check horn ok.    2551 brake frame test point and 1552 bogie 1 A/S test point air leak. Replaced both test points. Air leak test satis. Done by: Kumar/Saini/Din 9.7.24