1622 CE feedback intermittent rattling ~~~~~ 1622 A4 door, CE feedback intermittent rattling noise from underframe on curve track and when entering station. To check underframe measurements, wheel flange thickness and height, wheel vibration absorber security, shock absorber for any oil leak, CCD levelling valve cable and any fouling of the kinetic envelope.  1622 vertical stop clearance check (A/S=42mm, B/S=41mm). Check centre pivot lateral stop clearance S1/S2 - OK. Car height check within criteria. Wheel flange slope/thickness & wheel back to back check - OK. Checked wheels condition & found A4 wheel pitting badly, B4 wheel having thermal crack. A4 torsion arm nut found loosened. Retightened/torque to to 360KN. Notif 2266310 raised for wheel profiling.  Au TK 44298