SM(SBW) feedback that the first three cars of the external door lights did not light up. Staff(ADM) checked and confirmed positive. ~~~~~ Replaced #2503 & #2504 A & B side external door light. Carried out function test-ok. Done by Sateesh/Kumar/Koh. 16/03/20.     Replaced #3504 & #1504 both side A & B external light. #2504 not done. Done by Kamal/Deeshan/Henry/Din. 15/03/20.