2647 DT check found brake slow to releas ~~~~~ Check FC-308/330/331 happen multiple time,further check found ACU intermittent slow release durin DT check at EM to B3.Brake check no abnormal air leak,replace ACU and function test ok.BCP within cateria. #2647 ACU c/o:- Old s/n: 1442-037 New s/n: 1511-086 Not: 2431896 raise. Done by Koh/Sanip. 02/11/22