What was found
DURING DECENT, AT APPROXIMATELY 10,000 FEET, FLIGHT ATTENDANT CALLED STATING THAT SHE AND SOME PASSENGERS AT L3 AND R3 SMELLED ELECTRICAL FUMES. NO SMOKE SEEN OR OXYGEN REQUIRED. THE ODOR WAS GONE BEFORE LANDING. MAINTENANCE FOUND OVERHEAD LIGHT BALLAST 23DEF HAD FAILED. REPLACED THE BALLAST AND PERFORMED SATISFACTORY OPERATIONAL CHECK.