During 3 weekly found 1520 ACU air leak, ~~~~~ During 3 weekly found 1520 ACU air leak, to rectify.  Replaced #1520 ACU. Brakes function check ok. BCP ok. No further air leak sound. Old S/N: 1240-095 New S/N: 1510-141 Notification - 2589757 Done by: Gopal, Syahmi, Harith 16.4.24