DT 619/620 UNDERSHOOTDT 620 UNDERSHOOT TIME 0840HRS 00857HRS 1158HRS RS LOG SHOW 2620 BCP BRAKE ISSUE ~~~~~ DT 619/620 UNDERSHOOT     Replaced ACU on #2620 due to leak on exhaust port. Done by Saini/Aruddin/Haffiz. 01/01/20 ACU-New s/n: 1549-223  Old s/n: 1538-162 Not: 2115811 raise to RSW.