"The primary cause identified was a problem with the power supply and the degraded uninterrupted power supply, which had no link to the commercial power, and had to be connected to the other manually. The secondary problem was the power surge due to the power outage, which affected the equipment," said Bautista.
That power surge occurred when technicians tried to bypass the damaged UPS and sent 380 volts into the system, instead of the intended 220 volts, thus frying the terminals that receive satellite data from airplanes and air traffic management systems.
I am scared to think what the switch board looked like.