During DT check, found 3678 BCU fault on ~~~~~ 3678-FC: 307, 301, BCU Com. Error & BCU fault. BCP value & Brake cyclic test-Ok. Preventive swap 1678 BCU to 3678. 1678 BCU C/o done. Brake cyclic test, BCP-Ok.    Teh / Raghu / Ganesh.  17.09.2023. BCU swap 1678- S/No:18-47-405 To 3678- S/No:15-13-167. BCU C/o 3678 Old S/No: 15-13-167. Noti to RSW-2524467.              New S/No: 15-33-236.