The neutral and park safety switch provides a path to earth from the starter solenoid. A white and brown cable runs between the starter solenoid and the safety switch. Either the safety switch has become permanently shorted or the solenoid has found another path to earth or the gear selector is not operating the switch as intended. The first course of action would be to remove the white and brown cable from the solenoid and test continuity to earth with a multimeter with the gear lever in all positions. It should only have continuity in neutral and park.
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