Pax feedback to TC that car 3504 'A1' train doors rubber seal give way and was flapping. TC and staf f(BGS) checked and confirmed no abnormalities. ~~~~~ CHECK DOOR PHYSICALLY NO RUBBER SEAL GIVE WAY/FLAPPING.FURTHER CHECK FOUND LEFT SIDE RUBBER RUBBING THE DOOR.RE-ADJUST THE RUBBER SEAL SECURE CHECK DONE OK.FUNCTION CHECK DOOR DONE OK SHAHRIE 29.05.21