Train doors at FM1 car, 'A1' door was not proven closed.TC recycled 4 times for train to depart- o k. Train doors at FM1 car, 'A1' door was not proven closed.TC recycled 4 times for train to depart- ok. ~~~~~ FAULT CAN BE DUPLICATED INDEPOT.JUDDERING OF DOOR DURING OPERATION.CHECK AND FOUND LHS AND RHS DOOR MOVEMENT IN HIGH RESISTANCE AND DOOR ROLLER CHIPPED O .NO FOD WAS FOUND J RAIL AND GUIDE RAILS.NO AIR LEAK FROM ACTUATORS AND MANIFOLD IN OPEN/CLOSE POSITION.MEASURED 105VDC ACROSS MAGNET VALVE DURING DOOR OPENING NO RESIDUCE VOLTAGE DURING DOOR CLOSE CONDITION.REPLACED 1533 A1 DOOR AND DOOR ROLLERS DOOR OPERATION SMOOTH.DOOR CYCLIC  TEST OK.DIR ABLE TO EXTINGUISH.DOOR STATIC TEST OK.PUSH/PULL TEST WITHIN CRITERIA.10/20MM GAUGE PASSED. LOW KC/TEH/RAGHU 14.12.2022