According to an EMU Depot Technician, the actual wiring system condition in this class of commuter train had not similar at all with these Class 82 EMU Train Sets' Manual. Not similar at all. Cost for the recovery also is too high. If I am not mistaken as high as buying the new EMU or higher than buying a new EMU.
So, the best step and way is scrap. BOS or Brought Out from Service is the best way. There will no losses occurred because of these EMU Sets' Recovery Jobs.