The door locking mechanism solenoid contains two motors,one for lock/unlock the other is for the dead locking facility.
The motors operate on both sides to provide lock/unlock obviously one side has now failed.The units are of the sealed type,a second hand mechanism is the easiest option.
The units are packed with grease for optimum lubrication,I would refrain from trying to lubricate a working unit with products such as WD-40 as this will breakdown the grease in the unit.
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