What was found
FLT#2873, JFK-CHS. (AIRCRAFT DECLARED AN EMERGENCY AND DIVERTED TO RDU) 'PILOT : IN CRUISE ELEC FAULT { CYAN} EICAS 34 -CDC PWR MODULE INOP UPON FINISH OF ECL ENGINE VIB EICAS (AMBER)N2 INDICATION AMBER ENG 1 AT THRUST REDUCTION ABOUT 80 % PER ECL N1 EICSA WENT OUT; PERFORMED A220 AMP TASK BD 500 A- 372 -02-00 -16AAA- 0B5A-A TRANSIENT N2 VIBE AT 123 IPS FOR 75 SECONDS. STEPS 3 , 4 , 5 ACCOMPLISHED. NO TROUBLE FOUND. RAN ENGINE AT 80.3 PERCENT. N1 FOR 1 MINUTE. NO TROUBLE . OK TO RETURN ENGINE TO SERVICE.'