1. Disconnect the main power. Open the front door and remove the black plastic cover right beside the door by pushing the left edge of it with both 2 hands.
2. Locate the interlock and its sensor. Remove the highlighted 3 screws with 2.0 mm Allen-key, and take the assembly out.
3. Disconnect the cables. Remove the 2 screws with 4.0 mm Allen-key to take magnetic interlock out, remove the 2 nets with 5.5 mm wrench to take the sensor out for replacement.