TC reported smoke external at Front M1 car. Rear T253 line clear no sign of smoke. Staff(AMK) checke d no sign of smoke at Front M1 car ~~~~~ 1538 TC reported smoke external. Rear T253 line clear no sign of smoke. Staff(AMK) checked no sign of smoke at 1538. CE: 1538 having smoke external pre-alarm fault. No abnormality found. Reset fault cleared  1538 FC 721 registered once - resettable. Monitor but no recurrance. Security check - OK. Opr 20 raised To check plaseal and smoke detector Aqil 45035 To check plaseal and smoke detector Smoke detector no sign of water ingress,found pcb having rusty,c/o as preventive measure.Plseal done. Smoke detector:- Not: 2482813 raise.    Done by Sanip/Koh. 25/04/23