What was found
STRONG SMELL, ELECTRICAL, THROUGH COCKPIT & CABIN. RAN QRM, ODOR DISSIPATED WITH BOTH UTILITY BUSES OFF. FLIGHT DECLARED AN EMER & LANDED WITHOUT FURTHER INCIDENT. ACFT WAS REMOVED FROM SERVICE. RAN ALL SYSTEMS AS REQUIRED, PACKS, FAN, AUDIO & VIDEO SYS & ENG BLEEDS, UNABLE TO DUPLICATE. NO PROBLEMS NOTED IAW AMM 05-51-56.