What was found
IN-FLIGHT, THE RIGHT DC BUSS 1 CIRCUIT BREAKER TRIPPED. THIRTY SECONDS LATER, THE LEFT DC BUSS 1 CIRCUIT BREAKER TRIPPED RESULTING IN A TOTAL LOSS OF A/C POWER. THE PROBLEM IS BELIEVED TO BE DUE TO THE GCU OVERLOAD SENSORS BECOMING TOO HOT. THIS WAS CAUSED BY A BLEED AIR LEAK ON THE INBOARD SIDE OF THE ECS VALVE (RIGHT SIDE). (X)