Regarding the Electronics power Shutdown and unknown person who press the switch of fire alarm system security. Unaware that occurs when two days ago, in this case is a company holiday, but we have a contractor install equipment in the office on these days, So our lack of control people who working in the holiday. Supervision of these contractors could cause a person to act on unreasonable as negligence and damage to company property. QHSE Department and Safety officer have searched for the cause and corrective action, to solve problems and find out the preventive action for prevent a recurrence follows;