TIMS showed Smoke External Alarm at RearM2 car . Staff(ADM) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Re ar T232 line clear and confirmed no abnormalities. TIMS show ~~~~~ #2524 Smoke External Reset OK. 45021 Check FC-721 Check externalsmoke observed PCB rusty,c/o as peventive measure,function test ok. #2524-smoke detector Not: 2477184 Done by Rizman/Sanip. 06/04/23