3559 - Obstacle detected. To check & rectify ~~~~~ 3559 - Obstacle detected.(Train prep)  3559 checked ODR relay and relay base ok. Checked both A and B side obstacle detector wires resistance ok. No oxidation found. Checked TIMS unit CN-M4 cannon plug, no abnormalities. Reinstalled cannon plug and function test ok. Depot shunting 2x ok. No recurrence of fault.     Au TK 14.05.2024