2nd , from case MC01 that LUM cannot Open from SCADA, which happened all 3 times in this week, since the night of 9 March to the 11 March. The first time PSY maintenance found over current , changing Limit Switch, seconded times limit switch failure, Reset DPU and third times High circuit breaker failure, changing Limit Switch and High Speed Circuit Breaker new one of MC01. All of 3 times ECO can Open and Closed normally but PSY unknown the root cause. And now we ask the cause problems to the EMT. But still unknown root cause, and last night PSY maintenance observed MCO01, ECO can open and closed is normally.