Carefully de-solder the black, grey, white, and orange leads (boxed in red) from the side of the circuit board near the AF lamp.

Lightly heat the joint of each lead with a soldering iron as you apply slight tension to the wire with a pair of tweezers.

Do not excessively heat the board. Also, be sure not to accidentally melt the plastic case with the side of the soldering iron.

Repeat the process until all four leads are de-soldered.