Stuck brake at Front M2 car. STBS operated. ~~~~~ 2522 ACU replaced - Done. Function check - OK. Checked all solenoid v/v ohmic value of old ACU - OK. 2522 ACU S/N : OLD : 1002/004. NEW : 1240/099.  Sarma/Chan SW/Hanafi. 30/04/2020. EMU 521/522 SV S/N :           RF         RC          AF          EM          AC 3521 : 1902/600   1747/498     1851/255    1751/191    1851/286        (mode 4)  (mode 3)      (mode 4)    (mode 3)    (mode 4) 1521 : 1732/287   1732/309     1733/741    1732/046    1733/738         (All Mode 3) 2521 : 1747/681   1749/462     1744/921    1751/747    1744/914         (All Mode 3) 2522 : 1732/252   1732/238     1732/494    1733/221    1732/602         (All Mode 3)    1522 : 1744/192   1748/123     1744/887    1747/482    1750/607         (All Mode 3) 3522 : 1739/630   1749/435     1750/774    1751/328    1750/773         (All Mode 3)