SnapRep: T435 car 2541 near A1 door undercarriage had abnormal knocking sound. Staff(BGB) checked an d confirmed knocking sound coming from undercarriage at car 2542 near A1 door. ~~~~~ SnapRep: 2541 near A1 door undercarriage had abnormal knocking sound. Staff(BGB) confirmed knocking sound coming from undercarriage at 2541 near A1 door. CE checked & found 2541 bogie #1 wheel flat noise. NL:3 2541 A1 WF 10X15mm.     B1 Circumference Pitting. WSS Test - OK. Notification 2343281 Raised for Profiling Hanafi/Chan SW 44554