523/524 Air leak fail when train doors a ~~~~~ 523/524 Air leak fail when train doors a     Found door manifold air leaking and replacement done on the following cars: #1523-B4 door.     Not: 2263620 raise. #1524-B4 door.     Not: 2263621 raise. #2524-A3,B3 door.  Not: 2263622 raise.    Do door function test ok and carried air leak test with saloon door open 1 bar/5min.To ADDL and follow up with air leak retification. Done by Haslan/Kamal/Henry/Koh. 04/04/21