TC reported Smoke External Alarm at car3683. Rear Train did a line clear and reported no abnormalit ies observed. Staff(BSH) checked the train and feedback no s ign of smoke or heat on exterior or interior of train. ~~~~~ TC reported Smoke External Alarm at car     Replaced and checked all ok. Not: 2456155 raise. Done by Firdaus/Sufian.  26/01/23