What was found
RDU - FLT 4672 - IN DESCENT, A BURNING ELECTRICAL SMELL WAS EVIDENT IN THE COCKPIT. FLIGHT ATTENDANT SMELLED IT ONLY IN THE FORWARD CABIN. CHECKED NR 2 TEMP CONTROLLER FOR DEFECTS NONE NOTED. CHECKED NR 2 CONTACTOR AND FUSE FOR DEFECTS NONE NOTED. FOUND FORWARD AVIONICS INSULATION BEING SUCKED INTO AVIONICS FAN. RESECURED INSULATION. OPS CHECKS GOOD. NO FURTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. (M)