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 T262 line clear and confirmed no abnormalities. ~~~~~ TIMS showed Smoke External Alarm at 2549 car. Staff(AMK) checked andconfirmed no signs of smoke/ fire / burning smell on exterior or interior of train. Rear T262 line clear and confirmed no abnormalities. CE: 2549 smoke external alarm reset ok & fault cleared  2549 Replace External smoke #2 end and function test ok. Fault code: 731/735, Fire and smoke detector lost power Notification:2512704 Done by: Koh/Sanip 04.08.23