TIMS showed Fire External Alarm at car 1547. Staff(AMK) checked and confirmed no signs of smoke / fi re / burning smell on exterior or interior of train. Rear T2 07 line clear and confirmed no abnormalities. IMCC(RS) feedb ~~~~~ TIMS showed Fire External Alarm at car 1547   #1547 replaced ext. smoke detector (w cable gland and plaseal) and function tested satis. Notification to CSC: 2542395 Done by Saini,Haslan. 14/11/2023.