Pax feedback to satff(WDL) there was a knocking sound at Front M1 car when the train was moving. Sta ff(YWT) checked negative. No abnormalites when train is movi ng. ~~~~~ 1561 Pax feedback to staff(WDL) of knocking sound when train was moving. Staff(YWT) checked negative. No abnormalites when train is moving. CE : T249-1561 #1 bogie slight wheel flat.  1561 checked/found bogie #1 A2 (20mm x 20mm) & B2 (30mm x 30mm) wheel flat. Dump v/v function check - OK. Notif 2481315 raised for wheel profiling.  Khairul/Farid 45036 Notif 2481315 Name                              : FARID Date    Of    Occurrence          : 20/4/2023 Last    Service    Date           :   EMU/Equipment/Location            : 561/562 / Wheel / Bogie 1 Equipment Serial No. (if  any)    :   Description Of Fault/Cause        : 1561 BOGIE 1 (A2 Wheel flat                                      20X20mm , B2 wheel flat                                          30x30mm) Measurements    ( if  any )       :   Required   Rectification          : Require Wheel Profiling