TIMS showed Smoke External Alarm at RearM2 car. Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Rea r T414 line clear and confirmed no abnormalities. ~~~~~ 2543 TIMS showed Smoke External Alarm. Staff(AMK) confirmed no signs of smoke/fire/burning smell on exterior or interior of train. Rear T414 line clear and confirmed no abnormalities. CE : 2543 smoke external alarm able to reset. No abnormality.  2543 FC 721 smoke external. Checked smoke detector cable gland and plaseal - OK. Gasket checked & still in good condition. Swapped FCP from 2543 to 1543. s/n after swap: 1543: 114 2543: 111  Chan SW/Aliff/Redzwan 45197