What was found
AFTER ENGINE START AND TAXING WE HAD ELEC POWER INTERRUPTION. TAXI BACK TO GATE. SHUT DOWN THE NR 2 ENGINE THAT HAD NR 2 ENGINE CONTROL LIGHT ON, THE LIGHT EXTINGUISHED. RAN QRH. GROUNDED - YES. PERFORMED FIM 73-06 TASK 801, STARTED NR 2 ENGINE, RAN ENGINE FOR 2 MINUTES, NR 2 ENGINE CONTROL LIGHT REMAINED EXTINGUISHED, AIRCRAFT OK FOR SERVICE.