3537: UNDERSHOOT X4 ~~~~~ 3537: UNDERSHOOT X4 DT538 REPORTED UNDERSHOOT X4. FROM ATS LOG SHOWN DT537 BCP ABNORMAL FOR ALL REPORTED UNDERSHOOT. PLS HELP TO INVESTIGATE & FOLLOW-UP.THANKS. Signal refer RS.  3537 ER D/L & found brake slow in release. Replaced ACU & performed brake cyclic test - OK. No reoccurrence of brake fault.  Azmi/Khairul 44418 #3537 ACU S/N : OLD : 1034/012 NEW : 1048/034