DT676:UNDERSHOOT 676 UNDERSHOOT.FROM EVENT LOGS,FOUND ABNORMALITIES ON 3676 AKING.PLEASE HELP TO FOLLOW UP.THANKS. ~~~~~ 3676 UNDERSHOOT FROM EVENT LOGS, FOUND ABNORMALITIES ON BRAKING. PLEASE HELP TO FOLLOW UP.THANKS. SIG refer to RS.  3676 found holding brake. ACU checked no air leak. Replaced ACU & function check & cyclic brake test - OK. No air leak sound detected. 3676 ACU S/N : OLD : 1517/052 NEW : 1511/041 AF : 1932/321 (1.347 kohm) EM : 1902/995 (1.350 kohm) AC : 1740/270 (1.329 kohm) RF : 1740/806 (1.320 kohm) RC : 1902/613 (1.345 kohm)  Au TK 43898