What was found
DURING TAXI OUT NR 2 BUS POWER FAIL LIGHT ILLUMINATED NR 2 GEN UNPAR'LD LIGHT ILLUMINATED AND LEFT EMERG AC BUS POWER FAIL LIGHT ILLUMINATED ATTEMPTED TO PERFORM BUS POWER FAIL LIGHT ILL CHECKLIST COCKPIT SMOKE CONTINUED, SECURED 1-4 GENS MOVED A/C TO ISOLATED AREA ACCOMP EMERGENCY EVAC PROCEDURES DUE TO SMOKE IN COCKPIT. INSPECTED RELAYS AND WIRES ON NR 2 GENERATOR SYSTEM IN FLIGHT DECK AND GALLEY AREA. RAN BOTH PACKS AND RECIRC FAN WITH NO EVIDENCE OF SMOKE NOTED. NR 2 BUS PWR FAIL LIGHT, REPLACED NR 2 GENERATOR RELAY BUT NO HELP, DEFERRED NR 2 GENERATOR SYSTEM PER MEL 24-1-1.