What was found
(CAN) WHILE HOLDING SHORT OF THE RUNWAY FOR TAKEOFF WITH BOTH ENGINES AT IDLE THE NR 1 ENGINE AMBER REVERSE LIGHT BEGAN TO ILLUMINATE INTERMITTENTLY. FOLLOWING THAT THE NR 1 ENGINE ALT ELECTRONIC ENGINE CONTROL LIGHT ILLUMINATED INTERMITTENTLY AND SHORTLY THEREAFTER THE NR 1 ENGINE FAIL LIGHT ILLUMINATED AND THE ENGINE PERFORMED AN UNCOMMANDED SHUTDOWN. AFTER RETURNING TO THE GATE, MAINTENANCE PERSONNEL CARRIED OUT FIM 73-27, TASKS 804-805 AND REPLACED THE ELECTRONIC ENGINE CONTROL. THE ELECTRONIC ENGINE CONTROL IS CONFIRMED FAULTED WITH AN OPEN SOLDER CONNECTION ON THE MN76 BRIDGE BALL GRID ARRAY DEVICE.