Passenger feedback to staff (CCK)loudsound coming from aircon fan at car 2519. Staff (MSL) check ed and confirmed no abnormalities. Passenger feedback to staff (CCK)loud sound coming from aircon fan at car 2519. St ~~~~~ 2519 Passenger feedback to staff (CCK)loud sound coming from aircon fan. Staff (MSL) confirmed no abnormalities. CE found 2519 #2 Line Flow Fan slightly noisy.  2519 L #2 found noisy - Replaced L . Security/function test - OK. No abnormalities found during function check.  Abdillah/Junaidi/Faizal 44934 #2519 L  #2 S/N : OLD : 0422 NEW : 2133