A' side cab door repeatedly opened by itself. Cab door needed more force to fully close cab door. Tr ain was escorted to AMK for withdrawal ~~~~~ A side cab door repeatedly opened by itself. Cab door needed more force to fully close cab door. Train was escorted to AMK for withdrawal  Checked and observed cab door magnetic switch sensor out of criteria. Adjusted to 3mm gap with top latch sensor. Function test-ok. Tug test- DIR ok. Done by: Rizman and Koh