TC reported Smoke Pre-Alarm 2 in front DT car. Staff (AMK) checked and feedback no sign of smoke. ~~~~~ Checked from Tims observed FC-773 internal smoke #2 end. Pre alarm 1 happen multiple time. Further check smoke pre alarm 1 was no abnormalities. Replaced internal smoke pre alarm 1 sensor for preventive measure due to multiple times fault happen for further monitoring. Done by Koh/Sanip. 25/10/20.