3621 smoke external. To check & rectify. ~~~~~ 3621 smoke external. To check & rectify. (Train prep)  3621 FC 721 (Smoke external} Put 'Smoke External' to cut-out. Isolated/tagged. . . OPS 20 raised to BSD to follow-up to check on external smoke detector. . .  Aminur 44986  3621 smoke detector done.check ok .sridhar 01.04.2023