DT523/524: Undershoot by 2.4m in AMTrain undershoot by 2.4m in AM at LKS2 (09:09:50), BNL2 (09:13:28), TLK1 (09:29:17), GCL1 (09:38:54). LDC shows brake abnormalities during undershoot. Please check on BCP for brake blending. ~~~~~ * ,N * Checked fault record - 1524 having FC 323. Performed BCP test and checked all cars for anormalies. Found 1524 ACU hunting during BCP test. Swapped 1524 ACU (1318/134) to 2524(1301/125) - fault transferred. Replaced new ACU (1024/032) at 2524. Function tested ok. DONE BY: SHARIF/ARUN/TALIB 16.07.2023