3540 brake slow release found during dep ~~~~~ 3540 brake slow release found during dep     #3540 Found ACU AF hunting during brake cyclic B1,B2,B3 and B1    to coast heavy air purge at exhaust port.Swap ACU 3540 to 3539.Brake cyclic ,fault transfer to 3539.Replace ACU and function test ok.BCP within criteria.No abnormalities at ACU. ACU- Old s/n: 1048-035 New s/n: 1311-057 Not: 2316734 raise to RSW. Done by Saini/Haslan/Asruddin. 23/09/21