What was found
EWR---CO3433, CREW REPORTED ACW GENERATOR #2 FAULT LIGHT ILLUMINATED IN FLIGHT, SMELL OF ELECTRICAL INSULATION BURNING WAS PRESENT FOR ABOUT TEN MINUTES AFTER WE DESELECTED THE ACW GEN 2 PUSHBUTTON.......MAINTENANCE FOUND A CHAFFED WIRE AT ACW GEN #2 REPAIRED WIRE, ALSO FOUND #2 ACW GENERATOR CONTROL UNIT FAILED (SUSPECTED CAUSED BY CHAFFED/SHORTED WIRE)....MAINTENANCE REMOVED AND REPLACED #2 ACW GENERATOR CONTROL UNIT (GCU) IAW ATR42 JIC 24-22-84. OPS. CHECKED SYSTEM GOOD.