TC reported smoke internal at Front DT car. Staff (BGB) checked and confirmed no abnormalities. ~~~~~ 3534 TC reported smoke internal. Staff (BGB) confirmed no abnormalities. CE : T211-3534 Internal Pre-alarm Fault. Reset fault cleared.  3534 FC 720 smoke internal. Checked no.1 end smoke detector, no signs of water/dust. Swapped SDR1 from #3534 to #1534. Ops 20 raised to check no.1 end internal smoke detector.  Celine Tan 45237 BSD: 3534 To check no.1 end internal smoke detector #3534 int. smoke detector service and cleaned using airgun. To further monitor. Done by Yusof, Zul, Haikel. 12/11/2023.