DT567/568: UNDERSHOOTDT567/568: BOTH DT BCP SHOW ABNORMAL DT567 UNDERSHOOT 2.63M AT CTH1 1639hrs, 2.5M AT WDL1 1723hrs, 2.79M YCK1 DT568 UNDERSHOOT 2.83M AT BGB2 1752hrs, 2.32M AT KTB2 1823hrs, 2.54M at BSH2 1834hrs, 2.4M AT SOM2 1848hrs ~~~~~ 567/568: UNDERSHOOT. 2.63M AT CTH1 1639hrs, 2.5M AT WDL1 1723hrs, 2.79M YCK1. BOTH DT BCP SHOW ABNORMAL. 3568 UNDERSHOOT 2.83M AT BGB2 1752hrs, 2.32M AT KTB2 1823hrs, 2.54M at BSH2 1834hrs, 2.4M AT SOM 21848hrs.  2568 ER D/L. Replaced #2568 ACU. Brake cyclic test - OK. Residue pressure at COAST '0' bar. All brake pressure within criteria. Limited movement/depot shunting - OK. #2568 ACU S/N : OLD : 1301/122 NEW : 1037/048  Sarma/Anand 44400