DT568: UndershootDT568 reported for undershoot. Occured 3x. Observed Brake Blending at LDC Logs. Time of Faults: 1949hrs(BGB2), 1953hrs(CCK2) & 2036hrs(TAP2). ~~~~~ 2568 reported for undershoot. Occured 3x. Observed Brake Blending at LDC Logs. Time of Faults: 1949hrs(BGB2), 1953hrs(CCK2) & 2036hrs(TAP2).  2568 found FC 308/330/331/312. Swapped #2568 ACU to #1568. Faulty ACU replaced & function check - OK. Pressure reading (reading attached) - OK, no brake fault occurred during depot shunting.  Lee PT/Shafie 44405 #2568 ACU S/N : OLD : 1037/049 NEW : 1032/037