What was found
DEBRIEFED INBOUND CREW, SMELL PRESENT THROUGHOUT ACFT. IAW SAMC TURNED OFF BOTH RECIRC FANS AND UTILITY BUSSES SMELL DISSIPATED. OPERATED AUDIO SYS, VIDEO SYS, AIRFONE, ALL SIGNS AND LIGHTING. FOUND OVERHEAD FLUORESCENT LIGHT AT ROW 16 ABC INOPERATIVE, WITH SOCKET BURNED AND ELECTRICAL SMELL AT BALLAST. REPLACED SOCKET AND BALLAST. OPERATED PACKS USING BOTH APU AIR AND ENGINE AIR. NO FURTHER EVIDENCE OF ELECTRICAL SMELL.