EMU 521/522 Air Leak test fail. To recti ~~~~~ 525/526 air leak test failed   Checked found 1521 MR cock not fully normalised Location @ underframe bogie 2, B/S. Normalised and cable tie to secure the MR cock (Found no cable tie). Air leak test 0.5/5min. Done by Sanip, Koh, Rizman. 21/9/2023.