TC reported stuck brake at car 2541. TCoperated STBS to proceed to next station. SM(RDH) isolated B IC. ~~~~~ 2541 TC reported stuck brake. Level 3. TC operated STBS to proceed to next station. SM(RDH) isolated BIC. L3 2541 ER D/L & normalised BIC at #2541 & resealed STBS at #3541. Swapped #1541 ACU to #2541 & replaced #1541 with new ACU. Function check & brake cyclic test - OK. No air leak found. Limited movement/depot shunting - OK. No fault reoccur.  Sarma/Kana 44486 #1541 ACU S/N : OLD : 1301/123 NEW : 1307/048 #2541 ACU S/N : OLD : 1047/079 NEW : 1301/123 (from #1541)