EB applied in Auto at tk cct N771. ATS a3723, N larm shows due to overspeed. TC reported BCU brake fault at4 motor cars when the train EB; fault self cleared after thetrain came to complete stop. Reset EB and proceeded in Auto  ~~~~~ 3723-EB applied in Auto at tk cct N771. ATS alarm shows due to overspeed. TC reported BCU brake fault at4 motor cars when the train EB;fault self cleared after the train came to complete stop. Reset EB and proceeded in Auto VOBC-2.  3723 found bypass BLBS, rear able to release brake. 3723 normal, front & 3724 normal, front. Rear brakes unable to release. Checked line 1208 from 2723 & 2724 HMS continuity 1.1 ohm. OPS 20 raised to follow-up.  Goh AT/Chan GF 44067 To follow up.  723/724 uncoupled & cleaned auto coupler pins - Done. Function test both side 3723/3724 able to set SIR & brake released. Depot shunting - oK.  Selvan/Lee PT 44068