What was found
DURING TAXI FOR TAKEOFF, FLIGHT CREW WAS UNABLE TO OBTAIN ELECTRICAL POWER FROM NR 2 ENGINE IDG. FLIGHT CREW ELECTED TO RETURN TO GATE FOR MAINTENANCE. AIRCRAFT RETURNED TO GATE WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL FOUND ELECTRICAL CANNON PLUG ON FIREWALL (CORE-6 POSITION) WAS CONTAMINATED WITH DIRT, AND NOT ALLOWING PROPER CONTACT. MAINTENANCE PERSONNEL CLEANED CANNON PLUG AND PERFORMED ENGINE RUN. IDG CAME ON LINE WITH NO FAULTS. A/C RETURNED TO SERVICE. (M)