TC reported that the 'A' side cab door latching mechanism was loose. Video was sent to duty CC. TC r eported that the 'A' side cab door latching mechanism was lo ose. Video was sent to duty CC. ~~~~~ TC reported that the 'A' side cab door l #3509-A side cab door check and found latching mechaism screws missing.Resecure and tighten and cab door function check ok. Done by Gopal. 16/01/23