TC reported smoke external alarm at car3567. Rear T430 conduct a line clear and confirmed no heat a nd smoke. Staff(YCK) checked and confirmed no heat and smokeon exterior or interior of train. ~~~~~ TC reported smoke external alarm at car     #3567 Found smoke detector water ingress.Replace smoke detector and function test ok. Not: 2466425 raise to CSC Done by Saini/Zulq  01/03/23