TC reported internal smoke pre-alarm #02at front M2 car. Staff (AMK) checked and feedback no abnorm alities, no smoke and no heat. ~~~~~ 2720 TC reported internal smoke pre-alarm @No.2E. Staff(AMK) feedback no abnormalities, no smoke and no heat.  2720 FC 774 but reset by itself. Clean No.2E smoke sensor & function test - OK.  Shafie 43972