What was found
FLIGHT ATTENDANT SAW SMOKE AND SMELLED BURNING RUBBER AT ROW 16 SEAT A&C. FLIGHT CREW DIVERTED WITHOUT INCIDENT. MAINTENANCE PERSONNEL INSPECTED AND FOUND BAD BALLAST LOCATED ABOVE ROW 16 A&C. DISCONNECTED INOPERATIVE BALLAST, NO FURTHER DEFECTS FOUND AT THIS TIME. SIDEWALL LIGHTS WHERE PLACED ON DEFERRAL. SIDEWALL LIGHT BALLAST WILL BE REPLACED AND DEFERRAL CLEARED IAW AMM 33-20-00. AIRCRAFT RETURNED TO SERVICE.