Pax feedback to staff (AMK) of unusual noise from undercarriage at car 2536.Staff (NOV) checked an d confirmed no abnormalities. ~~~~~ Pax feedback to staff (AMK) of unusual n   #2536 Bogie 1 and 2; checked and found bogie 2 A4 wheel - wheel flat 50 x 55 mm, spalling and pitting. Dump valve function test ok. Notification to HM: 2505006 Done by: Sateesh (11/07/23)