Pax feedback to staff(YCK) car 2653 undercarriage noisy. Staff(YIS) checked and confirmed loud honki ng sound emitting from undercarriage non-stop. ~~~~~ 2653 Pax feedback to staff(YCK) undercarriage noisy. Staff(YIS) confirmed loud honking sound emitting from undercarriage non-stop.  2653 Checked/found Bogie 1 A-Side levelling Valve turn buckle dislodged causing air leak from levelling valve. Car height at min level. Reinstalled levelling valve and retightened lock nut. Car height measured and checked SATIS. No air leak detected. As preventive measures, security checked #2653 all levelling valve - OK.  Aliff/Redzwan 45404